I understand what you are saying but if you read the rest of my post it listed other possibilities. My buddy and his boy when using Pyrodex Select out of their guns they had no consistency. They may have a few, go where they were aiming, and thought they had it figured out, next few went way off. Average group size 5-8 inches at 50yds over the years for both of them. Very frustrating for all of us. When my buddy started shooting some of my BP, he went to 3 inch groups on the same day. That 3 inch group my buddy shot with 80gr 2F BP was THE BEST he had ever shot with his Cabela's 54cal Hawkins, that he had for about 5 years at the time. He had been shooting 80gr of Pyrodex Select. His son has a 54cal Renegade he has had for about 3 years couldn't get consistency with the Pyrodex Select. We tried multiple loads of 3F BP no consistency, 90gr 2F BP 2-2.5 inch group at 50yds. He took a really large doe free hand at 70 yds using that load last year it gave him the confidence he could do it. I got to watched the whole thing.
I have told this story before. Went to range some years ago shooting a 54cal caplock Lyman Great Plains Rifle. Shot the best I have ever shot using 95grs of Pyrodex RS shot a 2inch group with a couple of fliers that I knew I pulled the shot (actually still have that target on my gun safe). Went home pumped knowing the rifle was on and deer season opens in two weeks. Cleaning the barrel in the garaged door opening, had the barrel cleaned propped up against the tail gate of my truck. Wife comes down the street doesn't notice the door open hits the Garage door opener and it starts to close I start grabbing stuff bump the barrel it falls over knocks BOTH the front and rear site loose. Ball park the front site by what looks to be the pencil line I had on the edge of the front site before knocking it loose and centered up the fixed rear sight by the width of the barrel and the width of the sight. Have to go back to the gun range the next week. I CAN NOT get the gun to group at all shooting Pyrodex RS 7-8inch goups at 50yds. I had 2F BP I used for my flint lock in my shooting box, thought what heck had always heard it was more consistent than Pyrodex, NEVER believed it, but thought what the heck I'm desperate. Loaded 95gr BP, first shot 1 inch high center, next shot dead center third shot clover leaf the first 2 BP shots to the right. Loaded Pyrodex about 3 inches right and 3 inches high, next shot Pyrodex 2 inches low and 3 inches left, next shot BP cut the hole that was centered, and the last shot clover leafed the first 2 BP shots to the Left. Difference between the week before and that week about 14 degrees colder the 2nd week.
Point of all this being: That is why I also told him to try different loads with his Pyrodex RS with the patches he had before buying new patches, and to try Pyrodex P if the RS didn't work and to try different patches with that. I understand not every one has access to real BP. I also told him to try less lube on the patch which was something I learned from here which helped me tighten my groups and may help his. Point being I did not just say it was just the barrel needed shot in, it was one thing in a list of possibilities. The one thing I didn't tell him was to try swabbing between shots with a damp patch, not a dripping wet one, and to swab with a dry patch after that. Also to get a range rod to help with loading, swabbing, and cleaning. A range rod makes life a whole lot easier, for a day at the range, and cleaning the barrel afterwards. DANNY