>>64096358
Moving to 7mm will result in a Lighter bullet, higher BC, higher velocity, but shorter barrel life and longer appropriate barrel length for the same energy. That’s about it. Tbh I think an adequate way of improving 308 would be to cut the case down about 0.3” and use much finer bullets. Also raise the pressure. It’s not as much a barrel burner as 6.8x51, but yes it will come at the cost of a bit of barrel life. Picrel is hornady’s 750gr .510 A-Max. It is 5 calibers long. Scaling it down to 308 actaully gives you a really sensible bullet length to pair with the 2.8” COAL - a little longer than half the total length of the cartridge. As for mass and BC, if you made it completely out of steel (with a copper jacket) the way early experimental EPR bullets were made, it’s mass should be right around 150gr and BC should be around 0.26 (i7ff=0.85, but this can be improved still). Currently the m80a1 only has a BC of 0.19, which is dogshit, that’s the BC of 77g 5.56. My improved version would start off with less velocity and energy (at the same 60kpsi) but would overtake m80a1 within 100-200 yards. Don’t feel like firing up the external ballistics computer to say for certain so my estimate will have to do. Fight me.