Most all of the premium bbls are air gauged and hand lapped to give a very smooth and even surface through out the length. If installed properly they can shoot very well. If not you'll just have an expensive turd. Other things have to be taken into consideration, bbl gap, cyl alighnment, cone angle and leade and also thread crush. You should try your cyl first and then possably firelap the bbl if your results arent better. Haven't had one yet that it hasn't helped. A good trigger job doesn't hurt either.