458 socom loading data

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Today, Hornady’s business scope includes several distinct product categories including Ammunition & Components (that include pistol calibers from .380 ACP up through .50 BMG), Reloading Tools (including presses, dies & case prep tools) Hunting Accessories (such as range bags & targets) and Apparel & Accessories (including hats).We place limited powder inventory for sale on a regular basis on our website. When we are sold out, we are sold out. We do not take backorders and our Tech Services team cannot take orders via email or phone. The max order quantity of any powder SKU is 5 and we will only accept one order, per customer, per calendar month with a maximum weight ...The 458 SOCOM Subsonic Load Data offers a comprehensive selection of reloading data that can be used to tailor the perfect 458 SOCOM round. This data not …Load Data for .458 Socom . Bullet: 450 gr Plated SPITZER FCP (CamPro) Diameter: Powder: IMR 4198 (Improved Military Rifle) Starting Powder: 27.0 gr. Max Powder: 30.0 gr . Primer: Large Rifle . Case: Trim Length: Cartridge Overall Length: 2.245" Starting Velocity: Starting Pressure: ...%PDF-1.7 %µµµµ 1 0 obj >/Metadata 871 0 R/ViewerPreferences 872 0 R>> endobj 2 0 obj > endobj 3 0 obj > endobj 4 0 obj >/ExtGState >/ProcSet[/PDF/Text/ImageB ...What are some efficient features of top-load washers? Learn about 5 efficient features of top-load washers in this article. Advertisement Front-load washing machines may be the sup...Nov 8, 2016 ... TESTING AND HUNTING WITH 500 GRAIN SUBSONIC .458 SOCOM USING THE CMMG ANVIL AND THE BOWERS VERS 458 FROM SILENCER SHOP.

Re: 458 SOCOM Load Data. Using Reloder-7, Remington 2 1/2 Large Pistol primers, Starline brass trim 1.570", Hornady 325gr FTX for an OAL of 2.197", 40.0 gr …Hi, Im fairly new to reloading and only been doing 223. Been reading up on .458 Socom and seems one of my books has nothing on it and one only has limited load data. Anyone here reloading .458 easily with reliable results ? Powders, projectiles, load data ?? Any info appreciated.I've loaded a bunch of .45 with the TulAmmo with no issues, but it's not nearly as much powder as the .458 will be. CCIs should be hard enough. Just watch any load you work up now in the winter, as it gets warmer H110 will get hotter. So if your load is warm now it may be too hot in the summer.458 Socom Cast Boolit Data. I recently built a 458 socom and started reloading for it using jacketed bullets. I didn't want to pay jacketed bullet price so I decided to try some NOE 460-405 rf hollowpoint they come out to about 335gr with my alloy. I decided against these boolits because they would have to be seated far too deep to not …Jul 6, 2015. #1/9. as title says, looking to see if anyone who has the latest sierra load manual can check if it has any 458 socom data. problem ive been running into is its not a SAAMI cartridge. I'm not against buying another manual but id really only be buying this manual for that right now. i have lyman and hornady already.The .458 SOCOM ( 11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform. This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J), [1] similar to a light .45-70 but with a much smaller case. Load Data for .458 Socom . Bullet: 300 gr TAC-TX (Barnes) Diameter: 0.458" Powder: Lil'Gun (Hodgdon) Starting Powder: 24.5 gr. Max Powder: 26.5 gr . Primer: REM 2½ ... The 458 socom is hard to find data on . Only one of my 4 manuals has data . Lymans 50th shows 325gr ftx with H-110 , 26gr min / 28gr max with no pressure data . Max velocity is mid 1500fps _____ If Jesus had a gun , he'd probably still be alive ! ... and ran into the same issue with some loads in .458 SOCOM. What feels like a "safe" …

.458 socom reloading data 12-16-2019, 02:44 PM I purchased and AR Stoner 458 socom upper and I'm in the process of getting my dies and other odds and ends so I can get loading.Printed from Shooter's Reference on 04/28/2024: https://www.shootersreference.com/reloadingdata/458-socom/To make it easier to digest, I’ve put all the data in a chart. Keep in mind that barrel lengths for.454 Casull loads varied based on manual; the .458 SOCOM typically …Does anyone have load data for Subsonic 458 Socom loads? I'm thinking of using 410gr Hi-Tek coated Lead bullets from Missouri Bullet company through my SiCo Hybrid once it arrives. I have the Lyman AR reloading manual but it has no 400gr load data. I typically use IMR 4198 for my 458 loads.Load Data for .458 Socom. Bullet: 576 gr RNFP (ACME) Diameter: 0.458" Powder: IMR 4198 (Improved Military Rifle) Starting Powder: . Max Powder: 22.2 gr. Primer: WIN WLP. …InvestorPlace - Stock Market News, Stock Advice & Trading Tips Companies with high dividend yields can imply relatively high risk. However, co... InvestorPlace - Stock Market N...

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Web pages on the Internet cache data on users’ computers to expedite loading of the pages. Clearing your browsing history helps to free up disk space on your computer and enhances ...There are few things that irritate gamers more than a game that won't load properly. While slow load times can often be remedied by altering some computer use habits, sometimes th...Rifle Reloading (General).458 Socom Load Data; Download our Android App! Download our Apple App! ... 38 Special, .357 Mag, 40 S&W, 44 Mag, 45 ACP, .458 Socom, .223 Remington, 22-250,7MM Remington Mag, 30-06 and 340 Weatherby Mag, 50 Beowolf. 09-15-2018, 05:35 PM #2. Cncmachinist. View Profile View Forum Posts Private MessageSep 18, 2020 · The Hide Armory. Reloading Depot. Sniper’s Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Founded by Frank Galli in 2000, Sniper’s Hide has been offering informational videos, podcasts, and other support to its users in one location. Forum Statistics. Rifle Data. Rifle Data. Here you will find load data for some of the most recent cartridges on the market, with more being added each week. We are currently populating the cartridge drop-down menu with updated cartridge renderings, new propellants and bullets, and links to complimentary product pages. Cartridge.

.458 socom reloading data 12-16-2019, 02:44 PM I purchased and AR Stoner 458 socom upper and I'm in the process of getting my dies and other odds and ends so I can get loading.Apr 30, 2020 ... Gary wants data. You got it, Gary! Starline Brass 350-grain Speer Hot-Cor (2.198" COAL, 1.719" to Ogive) CCI Magnum Pistol Primer Hodgdon ...Shooters World Socom Smokeless Powder D063-01. Shooters World SOCOM Powder was specifically designed for the 458 Socom . SBR-SOCOM powder is a high density, double based, ball powder. The 458 SOCOM cartridge was developed by SBR Ammunition. This powder is an ideal choice for moderate to heavy bullets in the 300 – 450 gr weight range.If you carefully measure water capacity of the case with bullet seated, I think you will find that the .458 SOCOM compares very closely to the .45-70. You would probably not get into any trouble using pressure tested load data from reliable sources, such as Speer No. 13 or No. 14, for the same weight bullet, adjusting the powder charge in ...As the 0.458” diameter bullet is far less popular than the 0.224” needed to build the .223 Rem. or 5.56x45 mm NATO round, I decided it would be safe to embark on a SOCOM handloading journey...458 Socom Cast Boolit Data. I recently built a 458 socom and started reloading for it using jacketed bullets. I didn't want to pay jacketed bullet price so I decided to try some NOE 460-405 rf hollowpoint they come out to about 335gr with my alloy. I decided against these boolits because they would have to be seated far too deep to not …Warning! Notes: Tromix .458 SOCOM Monster, 16.25-inch barrel. Accuracy is the average of four five-shot groups fired from a sandbag benchrest at 100 yards. Velocity is the average of 10 rounds measured 15 feet from the gun's muzzle. All handloads used Starline cases and CCI 350 primers. All load data should be used with caution.The Ultimate Reloading Manual. With our load data you can search by caliber, bullet weight, powder, powder manufacturer or a combination of all four. Search over 311,644 loads! Metallic Search. Shotgun Search.Re: 458 SOCOM Load Data Anyone use IMR4227, Accurate 5744, Accurate 1680, or Accurate 2015 for the .458 Socom? These powders' burn rates are between (or REAL close, depending on the chart) to H110 and RL-7. There may be nothing to gain, but it is nice to have options to tailor loads.

Outside of the cartridge specs and reloading data, the .458 SOCOM is intended for semi-automatic rifles, which means—unless you’re John Wick or Jerry Miculek—you’ll be able to get follow up shots off significantly faster in a .458 SOCOM than you would a .45-70. That follow-up speed doesn’t include the speed lost because of the ...

The .458 SOCOM is a relatively large round designed for a specialized upper receiver that can be mounted on any AR-15 pattern rifle. The 300-grain round offers a muzzle velocity 1,900 fps. History Inspired by a supposed lack of power offered by the 5.56 NATO cartridge used in the M4 and the M16, the .458 SOCOM came about from informal458 SOCOM forums . link They shoot very well in all of mine. 1700+ fps out of a 6.750”, 2000 fps out of a 16”, and 2200 fps out of a 28”. I use H110 but cannot recall the exact charge and do not have my data available right now, but there is a lot of info on the forums.The data contains the correct grain weight of bullet. Berry's max recommended velocity is not exceeded. (This info is displayed on bullet boxes and product webpages.) Standard Plate Bullets Max Velocity: 1,250 fps. Thick-Plate Bullets (TP) Max Velocity: 1,500 fps. Do not over-crimp the bullet. Crimping so tight that bullet deformation occurs ...Today, Hornady’s business scope includes several distinct product categories including Ammunition & Components (that include pistol calibers from .380 ACP up through .50 BMG), Reloading Tools (including presses, dies & case prep tools) Hunting Accessories (such as range bags & targets) and Apparel & Accessories (including hats).Today, Hornady’s business scope includes several distinct product categories including Ammunition & Components (that include pistol calibers from .380 ACP up through .50 BMG), Reloading Tools (including presses, dies & case prep tools) Hunting Accessories (such as range bags & targets) and Apparel & Accessories (including hats).Subsonic .458 Socom. Since its using a AR/M16 rifle I hope it fits here,if not I can move it. I am building a 458 Socom AR and was wondering if anyone has worked up any Subsonic loads using a .460 480grn cast?. I have searched around and have found some load data but not much regarding Subsonic and especially not with cast,i have read that ...Jan 18, 2020 · Taurus1965 Discussion starter. 2624 posts · Joined 2016. #12 · Jan 25, 2020. Loaded up some rounds today for tommorows range trip. Load data is all over the place with .458 socom. Getting OAL FROM 1.85 TO 2.10 and powder from 26.gr to 33.gr with 350 gr. bullets and H110 powder. Like. 458 SOCOM Tromix heavy duty upper, 400 Maker REX, CCI 300, ?? gr CFE-BLK, 16” barrel, 1-14 twist. 5 shots 1,227, 1,218, 1,247, 1,274 and 1,231. ... All that said the standard primers have worked better on some loads. I don’t like Lil Gun because of how dirty it is and it seems to heat the barrel quicker. ... There isn’t much load data out ...Great LPVO Performance at a Great Price | The New Vortex Venom 1x6x24. [ARCHIVED THREAD] - WANTED: Your .458 SOCOM load data with Hodgdon Lil Gun. ARCHIVED. Posted: 3/28/2006 1:07:09 PM EDT. I am compiling load data for the .458 SOCOM and particularly using Lil Gun to help someone reduce "time to market".

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The .458 HAM'R® is designed from concept to completion to be the hardest hitting, most powerful (practical size) AR platform carbine ever produced, exceeding the ballistics of the .450 Bushmaster, .458 SOCOM and .500 Beowulf. By using an AR10 size bolt and barrel extension, this new cartridge is capable of handling maximum pressures … .458 Diameter Bullets 300 gr. HP/FN.355 Diameter Bullets 90 gr. JHC Power Jacket 95 gr. FMJ 115 gr. JHP Power Jacket 115 gr. FMJ 125 gr. FMJ 130 gr. FMJ.357 Diameter Bullets 110 gr. JHC Blitz Power Jacket 125 gr. JSP/125 gr. JHC Power Jacket 140 gr. JHC Power Jacket 158 gr. JSP/158 gr. JHC Power Jacket 170 gr. JHC Power Jacket 180 gr. FPJ Match Ammunition is not cheap though, even during normal times. That is one downside to all the big bores. On the plus side, the .458 SOCOM is easy to reload. Dies, reloading data and components are all available. .458-inch projectiles are common. For powder, my favorites are Lil Gun, H110 and IMR 4198.Load Data for .458 Socom. Bullet: 450 gr FMJ (SBR) Diameter: Powder: SBR-SOCOM (Shooters World) Starting Powder: 26.0 gr. Max Powder: 30.0 gr. Primer: Large Rifle.The Coyote Logistics Load Board is a powerful tool for trucking companies looking to maximize their profitability. With its easy-to-use interface and comprehensive load data, the C...While some load data may be interchangeable, it is best to use load data specifically tailored for .458 SOCOM. Is .458 SOCOM suitable for big game hunting? Yes, .458 SOCOM is commonly used for hunting large game due to its potent stopping power.The .458 SOCOM was developed by Marty ter Weeme, founder of Teppo Jutsu LLC in 2000. The impetus was an informal ("beer and barbeque") discussion with a senior member of the US special operations community regarding the apparent lack of effectiveness of the 5.56 x 45 cartridge in recent conflict. In particular, the reports from members of Task ...Western Powder Manual and Lee Manual have some loads. Hodgdon manual is the same as Lee. A lot of sharing. A guy that goes by Big Bore has done a lot of work on loads. Just type 458 Socom on the Google. There is a 458 Socom spot that has a lot of good information. ….

Since 458 SOCOM load data is hard to find and A.R. 15 style rifle’s are new to me I thought I would start a thread to get some discussion going on this subject. I hope to compare notes with a few of you guys and possibly spread more information about cast bullets and the 458 socom. I knew from the start that I couldn’t afford to shoot factory …Yes, reloading data for .458 SOCOM Hornady 325 FTX is available from various reputable sources and can provide guidance for handloading enthusiasts. 1. Can I use .458 SOCOM Hornady 325 FTX reloading data for other bullet types? Yes, you can use the reloading data as a reference for other bullet types, although adjustments may be necessary. 2.Subsonic .458 Socom. Since its using a AR/M16 rifle I hope it fits here,if not I can move it. I am building a 458 Socom AR and was wondering if anyone has worked up any Subsonic loads using a .460 480grn cast?. I have searched around and have found some load data but not much regarding Subsonic and especially not with cast,i have …There are few things that irritate gamers more than a game that won't load properly. While slow load times can often be remedied by altering some computer use habits, sometimes th...Look at it this way, .308 Win At the muzzle is about 2,700 ft.lbf of energy. 9mm is about 350 ft.lbf. That means .50 Beowulf is about 9mm more power than .458 SOCOM, but .308 Win is also a little under a 9mm of power over .50 Beowulf. I will absolutely contend that anything .50 Beowulf can do, .458 SOCOM can too. Find reloading guidelines and data for your Barnes Bullets products. ... 458 SOCOM 45-70 1895 MARLIN 45-70 RUGER NO.1 450 MARLIN 458 WINCHESTER MAGNUM Accuracy wise they’ve been incredible in all calibers I’ve used (300prc 200gr, 120gr 7mm-08, 140gr 7mm rem mag, 500gr 458 socom, 300gr 500sw). Haven’t killed anything with them yet though. Just developed loads. From what I’ve seen they’re supposed to work incredible on game.I never thought I'd walk off a fully loaded plane during the boarding process but I did just that to avoid another UK lockdown. Toward the end of 2020, here in the U.K., clouds on ...As a deer hunting cartridge, .458 SOCOM ammo works well with a 300-grain bullet at 1800-2000 fps muzzle velocity and delivering 2250 foot pounds of energy. It does not have the higher muzzle velocity of most big game cartridges but the energy behind that larger .458-caliber bullet offers excellent penetration at close range.This subreddit is dedicated to news and discussion about the 458 Socom cartridge. ... Acme 576 gr Subsonic Load Data? Anyone have subsonic load data for the Acme 576gr hardcast bullets out of a 16" barrel? I'm hoping to use either Lil' Gun or Accurate 1680 since I have a lot of both. Share Sort by: Best. Open comment sort options. Best. Top ... 458 socom loading data, Nov 8, 2016 ... TESTING AND HUNTING WITH 500 GRAIN SUBSONIC .458 SOCOM USING THE CMMG ANVIL AND THE BOWERS VERS 458 FROM SILENCER SHOP., Cartridge Name.458 SOCOM Brass Source Starline, Midway Shell Holder.45ACP/.308 Win Primer Size WLP, CCI350 Max Pressure 35,000 psi Trim Length 1.570-1.575 Bullet Name Barnes Remington Barnes Hornady Bullet Wt 250 XFN 300 gr JHP 300 gr X S 350 RN Item # 45831 RB4571 45802 4502 Powder H4227 Reloder 7 Reloder 7 IMR4198 Charge (gr) 37.5 42.0 40.0 38.6, The new issue of Handloader has an insert supplement on AR-Tactical loads that includes the 458 SOCOM, as well as the other big bores, but they left out the newer .458 bullets recently on the market, such as the Hornady 325 gr FTX and the Barnes 330 grain Flat Nose Solid, as well as a host of other bullets available to the 458 SOCOM. …, Taurus1965 Discussion starter. 2624 posts · Joined 2016. #12 · Jan 25, 2020. Loaded up some rounds today for tommorows range trip. Load data is all over the place with .458 socom. Getting OAL FROM 1.85 TO 2.10 and powder from 26.gr to 33.gr with 350 gr. bullets and H110 powder. Like., Mar 13, 2023 · The .458 caliber was achieved by simply bottlenecking the case. The .458 SOCOM is not a SAAMI-standard round, but Hodgdon’s reloading data center provides load data and indicates max operating pressures up to 39,400 CUP. Another attraction of the SOCOM round is that standard AR-15/M16 magazines can be utilized without modification. , The .458 SOCOM is a relatively large round designed for a specialized upper receiver that can be mounted on any AR-15 pattern rifle. The 300-grain round offers a muzzle velocity …, Sep 16, 2009 · The new issue of Handloader has an insert supplement on AR-Tactical loads that includes the 458 SOCOM, as well as the other big bores, but they left out the newer .458 bullets recently on the market, such as the Hornady 325 gr FTX and the Barnes 330 grain Flat Nose Solid, as well as a host of other bullets available to the 458 SOCOM. There ... , Watch this video to see how to remove a load bearing wall and put a beam in place supported by studs from home improvement expert Danny Lipford. Expert Advice On Improving Your Hom..., Rifle Reloading (General).458 Socom Load Data; Download our Android App! Download our Apple App! ... 38 Special, .357 Mag, 40 S&W, 44 Mag, 45 ACP, .458 Socom, .223 Remington, 22-250,7MM Remington Mag, 30-06 and 340 Weatherby Mag, 50 Beowolf. 09-15-2018, 05:35 PM #2. Cncmachinist. View Profile View Forum Posts Private Message, Jan 1, 2011. #3. Re: 458 SOCOM load data. There are several things you need to know about COAL: 1. If the bullet is seated deeper the pressure increases and if seated further out pressure decreases unless the bullet is so far out that it contacts the lands in which case pressure increases. 2., These copper plated bullets are then restruck to exact dimension and visually inspected. Offered in boxes of 50, 100 or 250 bullets. .458 Caliber (.458) 300 Grain Round Nose Flat Point Plated Bullets – 50 Bullets. $ 16.00. Out of stock. .458 Caliber (.458) 300 Grain Round Nose Flat Point Plated Bullets – 100 Bullets. $ 30.00., 458 socom reloading data 458 socom reloading data. By Kamotion May 28, 2015 in Rifle/Shotgun. Share More sharing options... Followers 0. Recommended Posts. Kamotion. Posted May 28, 2015. Kamotion. Members; 16 Share; Posted May 28, 2015. Have you seen this. I think it's the first time a powder company has actually published …, Load Data for .458 Socom . Bullet: 350 gr JSP (SBR) Diameter: Powder: SBR-SOCOM (Shooters World) Starting Powder: 30.7 gr. Max Powder: 34.1 gr . Primer: Large Rifle ... , The .458 SOCOM ( 11.63×40mmRB) is a moderately large round designed to work in an AR-15 platform. This is achieved by installing a 458 bolt and barrel. The 300-grain (19 g) round offers a supersonic muzzle velocity of 1,900 ft/s (580 m/s) and 2,405 ft⋅lbf (3,261 J), [1] similar to a light .45-70 but with a much smaller case., This subreddit is dedicated to news and discussion about the 458 Socom cartridge. ... Acme 576 gr Subsonic Load Data? Anyone have subsonic load data for the Acme 576gr hardcast bullets out of a 16" barrel? I'm hoping to use either Lil' Gun or Accurate 1680 since I have a lot of both. Share Sort by: Best. Open comment sort options. Best. Top ..., Hornady 300 gr. Load data. I've been shooting the 325gr ftx loaded with 37.5 grains of cfe blk for some time now and they are a very accurate round out of my tromix barrel. I recently picked up a box of the 300gr HP Interlock bullets to work up a load but thought I'd ask if anyone else is running them with cfe blk and what your col might be., Whenever, it is possible to measure a parameter accurately, it is a huge advantage to know/conclude what is happening. It will immediately tell you whether the combination is in-line with the published reloading data or not. The availability of affordable and accurate chronometers has put this measuring ability within reach of most reloaders today., 458 Socom Polished Fired Brass (100 Count) Rating: 2 Reviews Add Your Review. $71.99. SKU. 458socomfiredbulkbrass100. Notify me when this product is in stock. Excellent quality 458 Socom brass in stock and ready to ship now. Most customers are …, The 458 SOCOM Subsonic Load Data offers a comprehensive selection of reloading data that can be used to tailor the perfect 458 SOCOM round. This data not …, Load Data for .458 Socom . Bullet: 300 gr TAC-TX (Barnes) Diameter: 0.458" Powder: 1680 (Accurate) Starting Powder: 33.0 gr. Max Powder: 35.0 gr ., Load Data for .458 Socom . Bullet: 300 gr TAC-TX (Barnes) Diameter: 0.458" Powder: Lil'Gun (Hodgdon) Starting Powder: 24.5 gr. Max Powder: 26.5 gr . Primer: REM 2½ ... , 45-70 and 458 socom have the same bullet diameter458 SOCOM is similar to a light 45-70while 45-70s case is longer than 458 cases, you can use 45-70 dies as t..., Feb 9, 2021 · I found a thread or two with positive results for H110. This is for the lighter bullets weights (300-350 grainers). Judging from the load data most powders are slower than H110, probably be ause if the case capacity and length. Barnes shows use for it. Nosler’s fastest powder listed for 458 Socom is 4227, which also yields the fastest velocity. , Sep 1, 2021 ... 45-70 and 458 socom have the same bullet diameter 458 SOCOM is similar to a light 45-70 while 45-70s case is longer than 458 cases, ..., 2,580. 84. Bedford, Indiana. I am going to start reloading 458 socom. My rifle has a mid length, 16" barrel. I am using the Hornady 300 gr hollow points which I assume are similar to Remington 300 gr hollow points. But I can't seem to find any H110/300 gr reloading data online. My google-fu is strong enough to determine that a …, Feb 9, 2021 · I found a thread or two with positive results for H110. This is for the lighter bullets weights (300-350 grainers). Judging from the load data most powders are slower than H110, probably be ause if the case capacity and length. Barnes shows use for it. Nosler’s fastest powder listed for 458 Socom is 4227, which also yields the fastest velocity. , Location. East GA. Posts. 2,130. 458 SOCOM Loads. I recently aquired a RRA AR-15 in 458 SOCOM. My intent is to use it for primarily sub-sonic loads. I currently have the following molds: RCBS 45-300-FN, 45-405-FN and Lyman 457483 (385 gn). I will probably obtain a 500 grain or heavier mold as well., .458 diameter, 380 grain Wide Flat Nose Bullets (50 count) 45-70 Government: Wide Flat Nose: 380: VIEW: 05264126CuSP.264 caliber, 126 grain Controlled Chaos Lead-Free Bullets : 6.5mm Creedmoor: Controlled Chaos: 126: VIEW: 02458570LP.458 caliber, 570 grain Controlled Fracturing Bullets : 458 SOCOM, Remarks: OAL (inches): 2.24; 100-yard accuracy (inches): 2.50. .458 SOCOM reloading data with 5 loads. Using bullets from Barnes X-Bullet, Remington JHP, Remington JFP, …, I load my 350 gr Berrys bullets with 30gr Lil gun with CCI Large pistol primers in a Starline case. Excellent plinking rounds with good accuracy . Forgot to mention, I've been reloading for 12ish years, but just now got into 458. My experience is mainly 300blk, 6.5, 338, 30-30, etc. Appreciate any, and all help!, .458 SOCOM: Warning! Notes: Tromix .458 SOCOM Monster, 16.25-inch barrel. Accuracy is the average of four five-shot groups fired from a sandbag benchrest at 100 yards. …, The .458 SOCOM is a relatively large round designed for a specialized upper receiver that can be mounted on any AR-15 pattern rifle. The 300-grain round offers a muzzle velocity …, The SOCOM is an awesome cartridge that is basically a long 50AE (O.A.L. of 1.575") with a rebated .308 style head configuration, necked down to utilize a .458" diameter projectiles. It has been chambered in some bolt guns but it's claim to fame is in the AR-15 platform.