I load 12.5 grains of 2400 with a 180 grain XTP. I get about 1500 fps out of a carbine. I call tell a big difference between my load and factory 158 grain ammo when shooting deer. I shot this load out of my revolver too.

If I wasn't using them in a revolver I would load 15 grains of Lil'Gun and get another 100 fps out of the carbine.