for my 6.5x55 in 550 cz only, work up in your rifle. my rifle likes 50.5 grs N-560 for 2840 fps(cronied at 30 feet) with 140 gr hornady sst,s, and if i do my part 3 shot groups 1.5-1.75" at 200 yards from a bench . it also likes 48.3 grs N-560 with the same bullet at 2770 fps. NOT FOR THE...