I got out my old Grey Hawk, it has 1-48 twist.Seemed to like the Gn. 44 cal sabots. I used Speer 240 gr. JSP .429 over 70 grs. of Pyro P. 50 yds. with its open sights and my older eyes kept them on a playing card. Shot 5 times after i got the sights adjusted. Recoil wasn't bad at all. They did load abit harder than they do in my Blk. Dia. 50 cal. Spect they will do right fine out to 75 yds. on deer. I took 2 Doe's during the first ML season with that load in Blk. Dia. both were pass thru's, same load.