Our military adopting the Grendel?

[LRRPF52]

Perhaps you misunderstood. I didn't say the Grendel case couldn't take bolt-gun pressures. I said the higher pressures would likely have an adverse impact on weapon durability.

What pressure is your friend's bolt-gun load? 65,000 psi? Higher? How do you figure that's less pressure?

You were talking about loading the 6.5 Grendel LMG round longer than 5.56 mag length, so how do you figure it'd be any better in regard to OAL than the SPC case?

:confused: No further case development is necessary for 6.8 SPC, either.

Yeah? Prove it.

Yes we do need to play with the 6.8 SPC case because it isn't chambered in 6.5mm. Will it seat longer bullets well? Will it deal with pressures in a predictable manner? What powders will be best pushing 6.5 out of the SPC case? etc. etc. We also don't need to load the Grendel longer for LMG's, but if we tried longer pills in the 144gr weight, such as the Lapua FMJ, we might, but the Grendel has 4mm less case length than the SPC already, and I doubt we would need half of that for COAL.

The shorter Grendel case allows more compactness in receiver design, although it is probably negligible. For a belt-fed, you want a case with strong extractor rims that are thick, and a large space between the body and extractor rim edge, where the extractor grabs the case. Every mm of bolt throw will matter in the constant-recoil design, since we don't want impacting operating parts banging into the rear of the receiver, even with a buffer like the M60, M249, and M240. This requirement leans again in favor of the Grendel, although I do openly admit that it may not be that big of an issue with cases in the 39mm-45mm class.