Here's my take on flintlocks.
I felt, a few years back, that my life would be complete if I could just own a 38 caliber flintlock rifle.
I searched for several months before I found a Pedersoli in 36 that was close enough.
My first impression was that I had never seen a new rifle in such poor condition. Wood was poor and wood to metal fit was terrible. No problem, I wanted a shooter. I didn't get that either. It usually took 3-5 snaps before the thing would fire. I tried every flint I could find and all of the "fixes" I could come up with. A new flint would last about three rounds then it had to be knapped or replaced. I even had the frizzen heat treated. I couldn't give you a group size because I couldn't get three shots in a row.
I've often said that the reason you always see paintings of mountain men with two horses, is that it takes the second horse to carry all the stuff required to keep a flintlock firing.
Needless to say after about 6 months of agony, I traded it to a young warrior that had more patience than I.
He went to a rifle builder and spent more than the original price of the gun to finally get it to shoot. The primary repairs were a touch hole movement and a brand new quality lock.
I still love the front stuffers but I am a proponent of the theory that there was a reason for the invention of the percussion cap.
That said, that is a beautiful shotgun.