I use 46grs Rx7, average group @ 100 is under 1.5″ and I use a low-powered Vari-X3 mounted on an early (ported) Marlin Guide Gun. Velocity 1800fps +/- IIRC. Verify the above load in a good manual of course, and DO NOT use it in a trapdoor or any other rifle less robust than the Marlin 1895.