Flintlock accuracy and need help finding load

[westrayer]

Try FFFg. I have been shooting it for 40 years. Burns cleaner and faster velocities.
I know you don't have any but maybe someone is close to you and can help you out with a bit to try.
Given the money you have in the rifle, it would be worth the money to try some. My T/C and Lyman 1-48 twist guns shoot better than that at 100.

 

[andy52]

You may have indicated this in one of your posts, but I'll ask anyway: Are you shooting freehand or off a rest?
As suggested I would give 3F a try at about 80 or 90 grains, 58 is about the cut-off point for me using 3F larger I use 2F. Most of my flinters a capable of better accuracy than you show on your targets off the bench.

 

[HighUintas]

You may have indicated this in one of your posts, but I'll ask anyway: Are you shooting freehand or off a rest?
As suggested I would give 3F a try at about 80 or 90 grains, 58 is about the cut-off point for me using 3F larger I use 2F. Most of my flinters a capable of better accuracy than you show on your targets off the bench.

Those targets were off sandbags on a bench :/

I'll certainly try some 3f at some point. It just probably won't be before my hunt.

 

[Grenadier1758]

I had a rifle that suddenly the groups opened up. @HighUintas, have you verified that the sights are secure in their dovetails? It only takes sight movement shot to shot for groups to drastically open up.

My problem was the front sight was loose.

Did light conditions change?