Having a few good measuring tools and being able to use them accurately could make the whole process easy, for instance with a smooth polished bore of .500 a MMP_HPH24 [a lot of TC's]is perfect with one at .504 -502 [some White's] MMP 12 Now if you happen on to a tight bore say .497 -.498 a Chrush Rib or the new 3p will get yyou where you need to go. Its really has not been that much of a problem for those of use who enjoy experimenting and keep a varity on hand. Lee