Grendel as a Universal Infantry Cartridge

[JASmith]

How much more energy is developed by the 6.5x45 than the 6.5x39?

and

I was wondering how much LESS it would be. : )

We need to know two things: Case Volume and Max Operating Pressure.

There are a lot of other details, but these two items will tell us a lot.

Further, I think the 6.5 x 45 is based on the Carcano case, which has the same head diameter as the Grendel. This might be OK if one is going to a new platform designed to handle 55,000 to 65,000 psi in that case.

I haven't participated in the discussions for some time, but some attention should be paid to starting with the 25 Remington or 30 Remington case. This one can give the same volume as the 6.5 x 45 but with the same head diameter as the 6.8 SPC. It gets this with a somewhat longer case, but one that can still function within the 2.8" length of the 7.62x51.

The round count in a magazine of the same depth will be greater than either the 7.62x51 and the 6.5x45 and will likely be enough to make it attractive.