I appreciate the suggestions, but am not interested in eighty seven different calibers. I just want something in an AR15 platform, that uses already being made ammunition, and has some chance of being produced in bulk. There's Hornady, and AAC, PSA's ammo company, is planning on introducing both projectiles, factory ammo, and brass.

I see no use for a 300 BO, and neither for every new flavor of the month, however I do see a use for something with a bit of range punch, that's already being supported, and can replace the 308 range when I need something smaller, more portable, in any situation that an 11.5 SBR in 5.56 just won't do.

And not interested in 6.5 Grendel. Both David Fortier's trolling and toxic personal attacks against 308 users as well as LRRP from arfcom and his crusade to be a missionary that was relentless in being an influencer, has made Grendel obnoxious enough to never want out of spite and because I do not want them to ever think that they've won, even in private and unknown to them.