IMR 7828SSC Powder has precisely the same burn up rate and utilizes the identical data as common IMR 7828. Even so, due to the really quick kernels, metering is almost pretty much as good as with a spherical powder.IMR 7828 SSC is my go-to powder for .300 Gain Mag. The super-small grains make metering a breeze, And that i get steady velocities wit