This cartridge, however, the .458 SOCOM (.458 Special Operations Command) was reportedly given birth over a barbeque and some cold brew. They must be loaded to a narrow pressure. The lightest offering is a 200grain ARX (2,200 fps muzzle velocity / 2,150 ft/lb muzzle energy) to his heaviest, a 500g Jacketed Soft Point (JSP) available in Subsonic (980 fps muzzle velocity / 1,599 ft/lb muzzle energy) or JSP-High Velocity (1,280 fps muzzle velocity /1,818 … No one will argue the effectiveness of those cartridges on deer, but for bear, elk, and moose, the job had to be left to its bigger, heavier brother, the AR10 — where the mega rounds are found. The .45 Professional was ruled out because, in an interview with industry press, the developer of said cartridge stated that steel proprietary to General Motors was used in the bolts and extractor to withstand the high operating pressures. Standard magazines can be used for the bigger caliber, but do have to be modified slightly, and the sheer size of the round significantly reduces magazine capacity. Pulling the bullet showed a powder charge of 29.2 grains of a flake powder that filled the case to about 2⁄3 capacity. Mixed Headstamps and contains all brass finish. Looks like the .458 SOCOM shooting the 300gr Barnes TTSX zeroed at 100 will be about 13.5 inches low at 200 and dropping fast after that. Brass typically ships either same or next day with an estimated arrival time of 2-3 days. They are made by Starline and available from them, Midway or Graf & Sons, but due to a fast-rising demand and the general shortages we've experienced since the last election, there are currently brass shortages, and orders are going on backorder. A bit on the results before I go on. That puts it squarely in the territory of the modern .45-70 or .450 Marlin, and it will do anything those rounds will do. Odd Uppers: Hunting Small Game with an AR. Turning to the experts here. If you want your 458 to handle heavier rounds, you will need to have an upper receiver that’s strong and durable enough. A variety of loads are available in the 250 to 600-grain range. A gun lover since young, served the country for the last 20 years. While the differences between them (450 Bushmaster vs 458 SOCOM vs 50 Beowulf) are relatively large in a few areas, they’re all good choices for a wide range of hunting tasks. Other loads for reloaders are available from the Teppo Jutsu Web site, and a lively reloading discussion is always underway at the .458 SOCOM Forum. Since the SOCOM 458 is the heavier bullet compared to the Winchester 308, it is more likely to claim that the former has more bullet drop and arch when shot in long-range shooting games. Even the lightest.458 SOCOM round is more than three times heavier than the M855 round. Cons. ArmaLite engineers simply took their .308 AR-10, made it smaller, chambered and timed it for a new, hot .22 based on a blown-out .222 called the .22 Special, later named the .223, and resubmitted it as the AR-15. It's certainly big enough for elk, and there's not a deer alive that will walk away from a solid hit. During the development phase, various other cartridges were considered and proposed to the project sponsor, but rejected as not meeting all the requirements. The 458 Socom has come a long way since its adoption in the early 2000s by members of special operations, thus the name Socom (special operations command). The case length was chosen to be compatible with the Barnes 300-grain X Spitzer bullet. It turns your 20-rounders into 7-rounders and your 30-round magazines into something that’ll hold just 10 or 12. Looking to find some special fishing holes? Just get a .458 upper available from Rock River Arms, Teppo Jutsu, or other custom builders, get loaded ammo from SBR Ammunition, Corbon, or Reeds and go. Velocity range or timing goes to pot and reliability suffers. Of course, all of these other cases soon outperform the .458 SOCOM as bullet weights get heavier since they have the case capacity to push the 400-, 500- and even 600-grain heavy weights much faster. With those weights, you don't have enough powder capacity in the .458. Verify range and wind, aim a foot high of the boiler room and you are having venison for supper for the next few months. In 2000 a sledgehammer cartridge that would launch 250- to 600-grain.45 caliber bullets from a standard size AR-15 with a proper barrel and chamber was born — enter the.458 SOCOM. Durability. I have it on good authority that DPMS will be offering an A2 buttstock with a real recoil pad in the near future. 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