Sorry if I haven't picked this up from the detail but what calibre is your Trapper?

Mine is in 45 Colt and I use it for target shooting/plinking every week here in the UK. I've put several thousand rounds through it. I've shot everything from round ball to a Lee 340 gr bullet for the 45/70 sized to .454". It's astonishingly accurate with almost anything I put through it although it really likes 300 gr slugs at about 900 fps.