I shoot some 405 grain Ball-ets out of my .58 caliber 1-70 twist Renegade with 90 grains of Goex 2f and the accuracy is exceptional. Also the down range thump is pretty good too.

Ball-et just shoot good!! I use the longer ones (heavier ones)in the fast twist barrels. And of course the light ones in my slow twist barrels... These really are a nice difference from the roundball.

The 245 grain Ball-et shoot real well out of my .50 caliber Traditions Hawkins with 1-66 twist barrel and they shoot well out of my T/C Hawkins with the 1-48 twist. The 270 grain ball-ets shoot real good out of my Knight Woverine II.

The 310 grain .54 caliber ball-ets shoot excellent out of my Lyman Flintlock. They will shoot exceptional groups.I have not tried the 338 grain ball-ets.