The step in the nose is for no throat Marlins like mine. I had to seat deep with the original Lee RD normal L.G. When COAL was right they shot good as did the PB version. This was @ 50 when I was tinkering with sulfur hardened alloy & ESPC. Remington range front stands were junk, our range was shut down for a year. That mould is gone but had Tom cut me one with a slightly smaller meplat & grooveless that is doing good in 30/30 & BO, going to try the PB in 308W when I get to it. IIRC Carolina bullets used the stepped nose and they shot OK in the Marlin. Kinda an attempt at a bore-rider(?).