I have a 45 cal encore with the 1-20 barrel, I also sent it back to TC with letter stating I wanted the 1-28 barrel and what kind of problems I was having, they sent my same barrel back and said it would shoot 1-1/2" groups at 100yds with 100gr pyrodex and ?TC bullets, I have not tried it and I called them back and complained about there poor work, the 1-20 barrel will shoot some nice groups but they are very picky, my gun had to have a oversize hinge pin before I could get any groups at all, this is very important but TC will tell you that it does not make any difference, sorry for long message.