I fitted it with a breach plug. Barrel is parallel turned. 50 to 55 grains of FFg. patched .490 ball. I have been advised matchlocks don't like large charges of powder, and the guns of the Mary Rose were quite small calibre, .40 and the like. I proofed the barrel with 90 grains of fffg with a patched .490 ball, out of the stock and sand bagged, let of with a fuse. It will only get used on occasion for a bit of fun. Flint and cap are much more practical for hunting, which is my passion. Looks like you have a bit of experience too, I have been shooting bp since the early 70's
thanks for the interest