I must have shot that target a hundred times and never have shot a 50. For me, it was a nightmare. You are truly blessed.
Back in 76 or 77 I took my old caplock Renegade and traveled out of town to a rendevous, I was green as an apple. But I was also lucky. The old whitehaired and white bearded man shooting next to me was Mr. Charlie Haffner. He was shooting a flintlock of either .28 or .25 caliber. Can't remember that far back anymore. He saw my inexperience right off and sorta took me under his wing for the shoot. He could really shoot that flintlock. It was my first time being around one and I was hooked. Everything thereafter was just a stepping stone to flintlocks.
Some years back I asked Mr. Tip Curtis if Charlie was still around and to my surprise he was still kicking. For all I know he still is.
BTW, I don't see a photo of your rifle.