Using 29.0 grains of Lil'Gun with a 300 grain HC and WLP primer gets me a hair over 1,500fps out of a 6" barrel. 17.0 grains of N110 behind a 300 grain HC & the WLP is pretty accurate at just over 1,000fps and doesn't kick up the arthritis. As previous stated - I'm using cut down 460 brass, so I'm able to use large pistol primers but velocities should be close.