RE: 7mm Mauser (7x57)
One of my reloading books has the 7mm08(speer) out performing the 7 x 57 and the other (hornady) has it the other way around. the case capacities aren't really that much different the 7 x 57 has maybe 1/2 gr more capacity (ok I'm not 100% sure but I did do a water test a year or so ago and came to that conclusion), it has to do with the taper on the and longer neck on the 7 x 57 verses the straighter walls and the shorter neck on the 708