I set up my chrony with my M-L a few years ago. I got a very steady 1950 fps with a 250 grn SST out of my 50 cal Knight Disc, 26" barrel. My charge was 120 grains of Blackhorn 209 powder. Shocky's Gold powder was tested too, by my buddy. With the same charge weight & bullet he was down near 1450 fps with wild FPS swings. As mentioned, powder type matters a lot.