Well I bought one with the black syn SS barrel. Anybody who shoots one do you know if I'll be better off with regular harvesters or will I need to get the crush ribs. Or will the Knight high pressure work with the 300grn XTP Mag without having to break a sweat to get loaded? Thanks.

Ether The harvester Reg. Or the Knight HP will work you will not need the crushed rib.
the bore on my krb is .503.5 I shoot a .504 Bull Shop conical in mine.