300 Norma here as well. Just shot in the barrel. As I have not gotten my hands on the 230 Hybrids yet I am just forming the cases and breaking in using the Sierra 220SMK and doing some speed tests.
Barrel is a 30" Bartlein 1:10, 1.45-1.25" taper (heavy sucka)
Fed215GM primers
Vihta N570
220SMK...