I use imr 4227 a lot- 24 grs and I use 296 quite a bit also, in my shorter bbls- 4 5/8 sbh and 3" 629, but quick as I fill the freezer, I'm going to work with lil gun by hodgdon, they claim much better velocities than anyone else has, i'll see what they can do in my 7 1/2" redhawk and sbh, and and howw much they lose in the shorter barrels.