Im getting one of my Rem 700's re-barreled and was thinking of a caliber this approx size. I was told that 7 x 57 brass was tough to find..??? .280 case is a little larger..hence more powder but I think shooting animals of the proper size for these calibers it wont matter much. What do you think? 6 of one and 1/2 dozen of the other as they say??