I have one I bought back a couple of years ago, it's used, from a BP shooter about 2 hrs away from me.
I got the gun and thought it too small for me, and it was to be used by my young son, who's 8 now. He still can't hold it out too long. So, I ended up shooting it and totally falling in love with it! According to Dr. Fadala's Lyman BP book, the 60 grn FFFG load with a 125 grn, .360 Bullet is going at 1800 fps! In my experience, that's full house .357 Mag loads from a Lever Action rifle. As long as legal in your state, I believe this will take a Deer, Coyote or any other Medium size animal, very easily. This will be my 1st choice for a BP Javalina gun, next years season.
Light loads in 20-25 grns with a RB, are for small critters, Squirrels, Prairie Dogs, Birds, etc.
This rifle is about 40-50 yrs old and was purchased at a Rendezvous in 1986 by the previous owner, who bought it from a man in his 70's back then. He was told that a builder in WA state built it with the initials "SK"
I still I have no idea who it was that built this little beauty! But, it's by far, next to the faithful .45 Flintlock, one of the most versatile calibers of Flintlocks I own.
Here's a few pics of this fine old Flinter...