So I'm thinking of hitting the woods in the morning for the first time this year for a little squirrel action before the rain moves in. I decided I might take my Kentuckian Jager rifle and did a little load development this afternoon. It is a .45 flintlock round ball gun and shoots great with 70 grains of powder. So I bumped it down to 20 grains. Wasn't sure if that was even enough to fill the breech, but the testing went well. Only had one failure to fire but that was a pan primer (not enough) issue. And I was using Goex 4F in the pan and Pyrodex in the barrel. My target was one of those small propane bottles you use with Coleman stoves, lanterns, and such. It was empty with the pressure relieved so no danger of fireworks. Shot it five times and the rounds had no trouble penetrating on entry but none exited the target. Shooting at 20-25 paces or so. I am guessing that if that light load will penetrate one side of a metal container it should do for tree rats. I was able to shake one of the balls out of the can and it was only slightly flattened. I guess I can melt it down and reuse it. Little rifle barely kicked and made very little noise with that load. I posted this possibly boring thread because lately there has been much talk about Pyro in flintlocks and also several past threads about squirrel hunting with the .45. Thought I would share my experience with load and powder in case it may give someone else a starting point. Happy hunting folks.