I've shot a .505 Barnes Supreme on a ZKK602. Needless to say, a 600gr. at about 2,800fps kicks a bit(much more than I'll shoot today - "with age comes wisdom". I think his load was 125gr. IMR3031 with the Barnes 600gr., compared to a .460 WTB's 125gr. H4895 with 500gr.

Sufice to say, the 602's action is a wonderful base for a custom rifle. Anyone who can't get used to the safety needs to shoot the rifle more.