New Army "Caliber Configuration Study"

[stanc]

I'm going to compare it to a 7.62x54R round from a PKM 25.4" barrel, with a 148gr bullet at 2,717 fps with a 0.350 BC. I've guesstimated the BC, since internet sources vary so widely. Sierra bullets lists a BC of 0.397 for its .308 150gr FMJBT. If I'm being unfair to the Russian, speak now.

Speaking now.

Yes, I think it's unfair. One of the SME's on Tony's MG&A forum says he uses 0.406 BC and 2750 fps (for MV from the PKM).

IMO, 0.406 BC for 7.62x54R 148gr steel-core Ball seems reasonable. It's consistent with the middle of the BC range in test data on 7.62x54R.net, as well as published BC's for 7.62x51 147gr M80 Ball.