Six months ago I was in the same boat you are, I had a little cva squirrel rifle in .32 percussion and it was a sweet little gun, very small, seemed like a kids size gun but im a big guy, great gun though, the traditions crockett is very nice, .32 and percussion only though I think, then I found a pedersoli frontier flint in .36 at a gun show, offered 300 for it and brought it home, really nice gun, sparks good and super accurate with only 20-25 grns. of 3f, now fast forward a little and I sold off some rifles I collected since the black powder bug hit and I get a chance to visit Tip Curtis and handle some different style rifles, I brought home a southern style .36 flinter and love it, handles great and lighter than the pedersoli, anyway point being I guess, .32 or .36, both cheap to shoot, accurate, head shots only on squirrel with either I would think, .36 maybe a littler heavier for bigger varmints, handle some rifles if you can and get an idea of what fits you and and go from there, im sure someone on the forum could fix you up or send you in the right direction for a good custom/semi custom rifle, I bought from tip because I was there and could handle so many rifles and ive read good things about him, lots of good builders out there, get what you want and enjoy it.