I have used the Woodleigh 350 gr. bullet and the Swift 400 gr. I get about the same size groups with both (around 1 1/2") and velocity averages 2400 fps. I, however, do not use RL-15 or any of the other medium burn powders but I have found that both IMR and Hodgdon 4350, regular or short kernal produce better velocities, accuracy and no more perceived recoil. My charges with these bullets run from 90-94 grains and no indication of high pressure.