the faq<at the top of the heading> has all the ansers on fitting a barrel....yes most can with little trouble and minamal work.......about any bullets shoot good out of the huntsmans.......i use a xtp hornady 240 gr. bullet with a hornady sabot with 90 gr.loose pryo. for drop deed in thier track kills on deer......i only use the factory ramrod for field use, i have a rangerod for all my other loadings......jb