AMU testing 6.5 based on Carcano case

[stanc]

Thanks for the info, Stan. For the reader's convenience I note that metric case length for 1.873" is 47.6mm.

You're welcome, John. BTW, "BluntForceTrauma"? Are you trying to tell us something?

Any serious intermediate cartridge will have a high BC bullet, particularly if the AMU has anything to say about it.

Well, the case mouth to bullet tip dimension is approximately the same as that of 6.5 Grendel, so I guess it should be equally able to use high-BC projectiles.

I found it interesting that case shoulder angle is the same as on the old .30-06 cartridge. I would've expected them to not use the steep, bench rest shoulder of the Grendel, but I'm quite surprised to see them revert to such a shallow angle. Shows an emphasis on feeding/chambering reliability?

Of course, they can't just use the 6.5 Grendel, because that would be too easy. Not Invented Here. And doesn't provide the opportunity to sink development dollars into the procurement circus. . . .

To be fair, 6.5 Grendel can't deliver the desired ballistics from the shorter barrels currently favored for infantry rifles and machine guns. It'd be necessary to use 24" barrels, as per Tony's latest brainstorm (See http://www.65grendel.com/forum/showthrea...post102078), and that, IMO, is unlikely to happen.

Plus, the .264 USA case is long enough that machine gun links won't be a problem...