Ick...sounds like a real mess! Ummmm....I "think" that 8mm Mauser terminal balistics are a whole bunch over and beyond .308 Win. I could be wrong. I remember reading about it in a reloading manual that I've got here. But I think it's actually got a slight edge over .30-06 with heavier bullets (180gr to 220gr). I'm putting the break-in procedure up now. :-)
and the Yugo M48 is listed as 2600fps!!! but believe me... ALL Yugo ammo is hot Hot HOT.
so i kinda made a loose approximation till i can get good numbers on bullet weights
the older 98a with the round nose round was listed as 2853fps
i know a LOT of ads list .308 ammo as 2840 or 2880fps but i have no idea about 8mm ammo.
i bought three bandoleers with 70clipped rounds each for $45.00 that is supposed to be non-corosive but the head stamp says 7.9|FS|1944|CQT except the C is backwards and the T is upsidedown so i assume it's Cezc/Yugo/Cyrlic or something so i can't be sure.
I "think" the 8x57 gets around 100fps more velocity than the '06 when using 200gr. bullets. That's what my manual says. Inherently faster with the heavier ones. Pretty neat. I bet an Ackley Improved chamber ream would increase that too, but I am not sure, interior ballistics being a mystery to me.
I have several of these rifles, and plan to begin handloading for them soon, so may find out. I have been fascinated by the Ackley improvement for a while now, but never did it. Makin' plans, though. The great advantage being not only the 150-200fps increase, but that standard cased loads may still be fired, but expected accuracy is unknown to me. I may ream my air guage '03 some time, for slightly flatter trajectory, closer to the .300WM. I bet an Ackley .35 Whelen would be great.