Do you have the CIP standards to compare headspace lengths of 8x57 and 8x60? That will tell you if 8x57 ammo can safely befired in the 8x60 or not. The headspace would have to be identical, with only neck length different for them to be compatible. I suspect the 8x60 has a longer body than the 8x57, but do now have anything to reference that from. that would make them non-compatible.