Contenders are habit forming. I have had a bunch, starting with one of the first, a .22, .357, .45/.410 with the hand busting 2X4 grips on through each variation until I stopped with the last version before the G2.
Have accumulated barrels in 22lr (match, sometimes 1 moa at 100 yards on a really calm day with 10X), .222 (still in development), .357 (never had a .357 barrel from TC that would lead with any kind of decent load), .30-30 (double ear protection required), .44 mag (hotshot barrel, kind of worthless without the choke), .45 Colt (great shooter for ILL deer..straigt 10" oct), 45/410 bull (more fun with shot than ball).
Later on picked up a G2 rifle, {trigger not quite as good as the basic Contender}, in 45-70 and 50 X209, another one in .223 (first model frame, hard to open), another one in .22lr with the Recoil proof 4X TC scope {easy one-holers at 50meters with any good ammo). Last three are rifles. Have a .30-30 barrel for the rifles that will do an honest inch for 5 shots.
Bellm says a lot of T/Cs need work for accuracy but all of mine seem to do just fine.
Wish the 30-30 was legal here in IL. Someday I'll run across a .300 whisper barrel and go for it. Now I kind of alternate between the .357 and the .45 Colt, the latter of which seems to do a better job (big hole lets lots of air in and blood out). Might try a 32-40 if one crops up.