I had only shot TC flintlocks up until the time I shot the above rifle for the first time. The TCs were click, wosh, boom, this gun went boom so fast I couldn't even flinch. All my TC stuff was for sale after that first shot. The best thing about this gun is no matter what I put in it it will shoot a cloverleaf at 50 yards.
The barrel is a .44 but thas been shot so much over the last 50 years that is closer to .45 now. The friend who gave it to me said it had 50K shots through it , he put a pound of powder a week through it for years shooting 30 gr target loads.
You should shoot the Bill Large barreled gun, if it is like mine it is capable of some amazing things. My barrel is choke bored, no doubt about it.