300 rum 215 bergers

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    300 RUM 215 berger

    Just got some 215 and going to start load development with ADG brass and Retumbo powder I’ve been shooting the 212 eldx with 91.0 gr of Retumbo with great results I have a custom 300 rum with a carbon six barrel where would a good place to start for this setup . the 212 we’re running 3118 fps...