300 OSM equals 30-06 in AR15 platform?

[Casey Simpson]

Just to share information I stumbled across:

Olympic Arms introduced a new cartridge: the .300 Olympic Super Short Magnum. According to Olympic Arms staff, the .300 OSSM is a .308 bullet in a shortened WSSM case that was designed to shoot out of a standard AR-15 platform. The result? A cartridge capable of taking any game on the North American continent that can be shot out of a handy, lightweight rifle.
Introduced in conjunction with the Gamestalker rifle (see additional information here), the .300 OSSM is specifically designed for big game hunting in North America. The cartridge is capable of launching a 150 grain, .30 caliber bullet at more than 3040 fps from a 24″ barrel. In a 22″ barrel, the same bullet is traveling at just under 3000 fps.

http://www.oa2.org/forums/viewtopic.php?t=9155&postdays=0&postorder=asc&start=0

110 grain Hornady V-Max
Powder 50 gr. H735
Ave. pressure, 60,300 psi
Ave Muzzle Velocity 3480 fps

115 grain (solid brass with plastic tip: Barnes?, not sure, details not provided)
Powder 48 gr. H735
Ave. PSI 55,700
Ave Muzzle velocity 3358 fps

150 gr. (bullet unkown at this point)
Powder IMR8208XBR (new powder)
Powder charge (varied from 45-51 gr.)
Ave. PSI 56,6000
Ave. Muzzle Velocity 3043 fps

 

[bowslngr]

Re: 300 OSM equals 30-06 in AR15 platform?

True enough. I have one of these (the 22" version). My first 17 rounds out of it averaged 3008 fps with the factory HSM 150 grain load.

That said, it's accuracy with that load (which is currently the only factory offering) is pretty bad. I get 5 shot groups at 100 yards of anywhere between 2.25 and about 5 inches.

Dies on order from Hornady, but it will be a while before I get them.