Thanks, Steve. Funny that you should mention that, 'cause I had had a similar thought. It would pretty much mess up my entire day if the lil' Beast took a big bite outta my face...lol At my age, that would ruin my chances for a date...even if I could get my wife to agree...lol

I can easily see you do have a bit of humor, pretty clever in fact!
FWIW; I also shoot a .69 smoothbore, and I use 70gr FFg, one OP card, one .5" Vegie Wad split in one-half, and 1.25 oz of shot, with two OS Cards,....experimenting over the years tells me this combination is about as good as I'm going to get, pattern wise.
Insofar as shooting a Patched Round Ball, I would much prefer to throw stones as I think I might do better.....5 / 6" groups at 25 yds is just not my cup of tea.
Still yet, as a scattergun, it's my go-to gun for upland hunting....anything that requires a little heaver load.
It has Rifle sights, adjustable sights in fact, which is okay as a scatter gun, but they are are all but useless when it comes to shooting PRB.
Now my .56 cal smoothie is a hoss of a different color. It shoots roundball beter'n I can hold it.... every time, no matter what load. I love my .56. Only thing is my shot load is typically 1 oz, I have shot 1 1/8 oz and 1 1/4oz, but....not as good of a pattern as my standard load of 1 oz #7, sometimes #6.....
Now your question regarding that barrel....Brass is not going to have the strength of steel, I think we can all accept. But a "Safe Load" in a Brass Barrel, just might require a looong string in testing. I have no clue and my research didn't turn up anything useful.
Couple pictures of me, at least 10 years back,, with my .69 cal Flintlock smoothie.
It's a good looking gun, in fact, it's a killer for looks with a stock of really nice wood.
