Nice gun Osprey.
I just finished up a fowler with the same barrel with a walnut stock and a Chambers round faced english lock. I had mine jug choked to modified.
Got out for my initial shots this past weekend.
Started with round balls to figure out my required sight picture, then switched over to shot.
80 grains of ffg and an 80 grain measure of 6's is a bit heavy on the recoil. The purple is almost gone out of my upper lip now. Ha!
The gun patterned well though.
I'd like to hear about your testing.
I'll try to post some photos later today.
Greg