It wouldn't surprise me but to manufacture/sell a round I would think they would need to comply with SAAMI specs. Throat length is something dealing more with the barrel and the difference in custom chambers and factory chambers can be fairly substantial sometimes.
6.8 is a pretty BA cartridge though, a lot of punch. Unfortunately I don't think its future as the new service cartridge in the military is going to happen, not in the near or intermediate future anyways. Folks can say "bolt, barrel, magazine is all you need" but thinking that Uncle Sugar has hundreds of thousands of perfectly fine functioning 5.56 rifles sitting around, well, the math doesn't add up. Yeah, yeah, gov't wastes more money buying paperclips for congress but the 5.56 is the legacy cartridge. In my humble opinion, we'll see every last ounce of life squeezed from the M16/M4 platforms before anything major happens. Look for the basic cartridge to upgrade first. The Mk262 rounds are getting more and more common downrange. While producing the amount of Matchkings to load up DoD stocks would be 'spensive, developing a heavier, say 70-75gr FMJ, wouldn't. The capability of the round is increased and all without ever changing every bolt, barrel and magazine. The 1/7 twist will spin bullets slightly past 80gr. So why I like to shoot my 6.8, admittedly in an AR platform at the moment, 5.56 still has a lot of life left in it for the tiem being.
6.8 is a pretty BA cartridge though, a lot of punch. Unfortunately I don't think its future as the new service cartridge in the military is going to happen, not in the near or intermediate future anyways. Folks can say "bolt, barrel, magazine is all you need" but thinking that Uncle Sugar has hundreds of thousands of perfectly fine functioning 5.56 rifles sitting around, well, the math doesn't add up. Yeah, yeah, gov't wastes more money buying paperclips for congress but the 5.56 is the legacy cartridge. In my humble opinion, we'll see every last ounce of life squeezed from the M16/M4 platforms before anything major happens. Look for the basic cartridge to upgrade first. The Mk262 rounds are getting more and more common downrange. While producing the amount of Matchkings to load up DoD stocks would be 'spensive, developing a heavier, say 70-75gr FMJ, wouldn't. The capability of the round is increased and all without ever changing every bolt, barrel and magazine. The 1/7 twist will spin bullets slightly past 80gr. So why I like to shoot my 6.8, admittedly in an AR platform at the moment, 5.56 still has a lot of life left in it for the tiem being.