I can be very wrong but I thought the original parent cases back in the 1890's were extremely similar if not the same. But the 7.9 x 57 (8 x 57) case evolved to its present form sometime in the interwar years. As a result of not only projectile diameter difference but also bullet weight and material conservation. Like war effort. The cartridge definitely went thru an evolution period. Think Olson hit on some of this in his Mauser book. Don't remember it all. Have destroyed considerable brain cells since I last read it! smile

Good luck in your endeavor!


Founder
Ancient Order of the 1895 Winchester

"Come, shall we go and kill us venison?
And yet it irks me the poor dappled fools,
Being native burghers of this desert city,
Should in their own confines with forked heads
Have their round haunches gored."

WS