can someone tell me what the magbox lengths are for the 600Zkk(06" length action) and the Zkk601(308 length action)?
Is there enough room in the .308win action to fit the 7x57? Would make a lighter rifle if it fitted, I would be happy with about 3.2" I can load a 160NF at the base of the neck for about that length.
cheers.

There isn't enough length in the 601 magazine for the 7x57 unless you seat your bullets very deep. I just tried it on one of mine.

I can confirm what fla3006 said, the mag in my 601 was 2.820"