About 1200 fps with a 385 grain .50 cal Hornady Great Plains bullet. I am sorta scared to shoot a sabot 240 .44 bullet over my chrono, afraid the sabot will smack it, but a 250 grain Lee REAL bullet (didn't work, too light for the fast twist) clocks over 1400 fps from it, so I reckon a 240 is up there with a hot .44 mag from a 6" N frame. All shots fired with 90 grain equiv. Pyrodex RS. It is very accurate with either bullet, a little moreso with the sabot. I get 2" at 100 yard groups with the sabot, but I kinda like that big chunk of lead. I have a 360 grain Minie mold for that shoots well, too, but you have to use soft lead. Hard range scrap doesn't seem to work well, doesn't spread the skirt. So, hell, Hornady great plains bullets are cheap enough. LOL