My Vartarg has a #3 contour 22.5" 1:12 twist barrel. It is a hammer with 32 sierra's, 32 V-Max or 32 Nosler ballistic tips. It also shoots 35 Bergers and 39 Sierra BK's well, but does not like the 40 V-max. If I was to build another one, the only thing I would change is to go to a 1:11 twist just to be able to use a larger variety of 40-45 gr pills for the occasional coyote. But the 32's work great on the smaller vermin and provide exceptional consistent accuracy even from a carry rifle.