300 Norma, chambered by PVA with Hawk Hill 1:7 twist @31", for the PVA 212's and 241's, as well as Cutting Edge's 230's
The 241's with that barrel like H50 BMG. At 91 gr, velocity was at 2780, .020 of the lands, .336 bushing, no pressure, but was at 102-ish% compressed load. Other powders that...