I have a Win 94 with slow twist. It definitely prefers bullets in the 210-230 grain range. As bullets get heavier, accuracy gets worse. The heaviest bullet I tried was the big Lee 310gr. I could have done better with a slingshot. I don't lose sleep when using "light" .44 bullets for hunting as they've been killing deer for about 150 years. For larger game, I suppose I'll have to use a Rossi 92 (mine loves the Lee 310gr).