checked another forum. this guy said it worked good in his 22 250 40 grain blitzking 4150 fps. said it was tem sensitive that was 34.5 grains backed down to 33 gr for 3900 fps. didnt mention other bullet weights . Ill start 10 percent lower with magnum primer. thats all I use for acc 2200. Now they make this powder again wonder if the quality control is better. Understand it was originally surplus Check powder for the 762 x39. anyone else use this powder. I really do like it but it burns a bit dirty