Thanks for the tips guys. I finally got to try it last Saturday. I only had enough time for 13 shots and only at about 25mt, but it was mighty fun all the same.
Out of the 13 shots, only #10 failed to fire for lack of sparks (maybe I touched the frizzen with oily fingers from the patch) and I only got one flash in the pan. I forgot to prick the charge before that one, but once I did it, it fired ok. The pick was hard to stick in the touch hole, so I guess I had packed the powder too tight. Anyways, I was expecting a worse performance, since I was using an agate flint, so I’m happy with what I got. Especially, since I was using an agate that had about 15 or more dry shots on it already. I fired 13 shots and never changed it nor turned it around. It isn’t sharp anymore, but I’m sure I could still get a few more shots from it.
I also ended up soaking my patches some more because they were feeling kind of dry, and because I was going to fire the rifle right away. They worked every time. There’s one thing I need to mention, though: I bought pillow ticking at Wal-Mart that my caliper said was 0.018” thick. I then washed it, because I read somewhere that the tissue comes with some kind of color fixative that may prevent it from absorbing the lube. The problem is that, once I applied the lube it was hard to load a .490” ball, so I checked it again when I came back home and certainly enough, it now mikes at 0.021”. They still worked, but I was glad I had a thick aluminum range rod to load them with, because I don’t think I could have done it with the wood rod that came with my rifle.
Here is a pic of my first target ever with a flintlock, the first 3 PRB’s loaded in front of 70grs of Goex FFg:
They hit right to POA. I still need to get used to the flash, though.
80grs did just a little worse, but not a big difference. I also tried Remington’s 365gr Gamemaster HP bullets, but aside from giving me a little more recoil, accuracy wasn’t any better. I got the feeling that these bullets need to be loaded as fast as possible, to offer any real accuracy out of this 1/48” barrel, whereas the PRB will probably be even more accurate with a charge smaller than 70grs.
I have more impressions I could share, but this is kind of long already, so I'll stop here. Looks like I’ll have something else to play with for a while, before I find the right loads, so this should be lots of fun. Thanks.