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300 Rum and Berger 215 Hybrid velocity?

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.
 
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