- 458 socom bullet that performs well at subsonic speed professional#
- 458 socom bullet that performs well at subsonic speed crack#
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. 499 LWR cartridge was still in the development phase and had not been chambered commercially. 45 Professional (which has since become the.
The cartridges considered were 7.62×39mm, 9×39mm Grom. During the development phase, various other cartridges were considered and proposed to the project sponsor, but rejected as not meeting all the requirements. The project sponsor set forth a number of specific requirements including that the cartridge fit in the M4 carbine and be capable of firing heavy-for-caliber projectiles at subsonic velocity using suppressors. Marty ter Weeme of Teppo Jutsu and Tony Rumore of Tromix designed the cartridge in 2000 and Tromix was contracted to build the first. 458 SOCOM came about from informal discussion of members of the special operations command, specifically Task Force Ranger's experience that multiple shots were required to incapacitate members of the opposing force in Mogadishu during Operation Gothic Serpent. Prompted by the lack of power offered by the 5.56 NATO cartridge used in the M4 carbine and the M16 rifle, the. 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), similar to a light. This is achieved by installing a 458 bolt and barrel. 458 SOCOM ( 11.63×40mm) is a moderately large round designed to work in an AR-15 platform. Now I just need to get my can outta jail, so that I can start running these over a chrono on my property (without pissing off the neighbors).The. Even what I perceived to be supersonic was only registering around 109-112 dB. When things stayed subsonic, was getting 91-104dB with measurements taken ~2 ft left of the lower receiver, and in the high 80's 1m behind the shooter.
458 socom bullet that performs well at subsonic speed crack#
No chrono at my range, but did have a dB meter - and the 15.0 and 15.5 both seemed to crack into supersonic at 5,500' of elevation (indoor range, 70 degrees / probably 40% humidity). Was firing offhand, focused on function, so groups aren't indicative of anything other than my patience - hence no pics. Though I'll obviously be carefully monitoring that issue. I had two slam-fires, 1 in 7 rounds of the 14.6 and 14.8 loads - but that seemed to be a primer depth issue. (and I know the Roman Numeral system my marking technique is my own). Groups were consistent - don't mind that groups II and III are lower than IIII and V, I was adjusting my optic at the same time. The 15.0 and 15.5 ran a little hot, with a bit of a twang in the buffer/spring. Everything cycled properly, including slide-lock / BHO. Ranged from 13.5gr to 15.5gr of powder (which is, for me, an uncomfortably low case load volume at ~30-35%). Still to early to give final info (I'm actually loading up for another set of ladders tonight). Suppressed with a Rugged Obsidian 45, using their fixed mount adapter - all measurements in the full-length configuration. Shooting from a 10.5" 1/14 Gibbz Arms G4 Non Reciprocating Side Charging Billet Aluminum Receiver, on a Franklin Armory Libertas BFS lower with carbine buffer tube assy. I worked up some loads with the Berry's Superior Plated Round Shoulder 350gr, using HS-6, and CCI350 primers.
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