Well, you sort of have 3 roads to pick from.
Road 1 is the modern, in line muzzle loader. Probably uses a 209 shotshell primer, using saboted jacketed pistol bullets and Pyrodex pellets. Accurate, reliable. And a Big Mac is good food.
Synthetic stock, stainless steel
Second path is a modern version of a traditional caplock, like a Hawken. May have coil springs rather than leaf springs, but looks a lot like the rifle that an explorer would have bought in St. Louis on his way West. Sidehammer, #11 percussion cap, probably shoots a maxi ball and Triple 7 powder, many have double set triggers. Walnut, blued steel, pretty guns, as accurate as you are.
3rd way is the Uber Traditional. Daniel Boone would feel right at home with your Pennsylvania long rifle. Flintlock. LONG barrel. Walnut, brass furniture, browned steel. Shoots a patched round ball with Goex ffG black powder. You probably slaughtered the steer and rendered the tallow to lube your bullets.
And you know what? All 3 are fun. Pays your money, takes your pick.