300 Rum and Berger 215 Hybrid velocity?

[brentc]

The charge really depends on what brass you're using. If you're using RP it will take about two grains more powder than Norma/Nosler to reach max. However, Norma/Nosler brass still reaches equal velocity to the RP despite the smaller powder charge. In Norma brass I'd expect max with a 215 to be around 90 grains of retumbo.