Well Mark,
Since you brought it up....I have been trying to settle on a powder charge/patch for my 40 cal. flintlock ahead of the NMLRA Spring shoot. One of the curses of being a Scientist, is I always want to try something new.  Ever since September, I've bounced around the 35-50 gn. range. Finally settling on 50 gns. 3f Goex and a .014-.015 ( compressed) patch with Lehigh Valley liquid lube.
Loads easy, and holds true from 25-50 yds. That is to say...I can use a center hold across the course from 25-50 which helps a lot when shooting "random shapes" on the primitive range where I spend most of my time. Going to 100 I'm finding 65 gns. seems to work, once again, with a center hold.
Down here in Florida, (Port Malabar Rifle and Pistol Club) we're having our "Gong Shoot" tommorrow ( 5/13/17).
Round Steel targets, hanging on chains at 25-50-100 yds. All shot offhand. I don't have the exact diameters, but at each range, the steel targets we're using are pretty close in size to the black bull area on the NMLRA targets for each distance.
Hope to see everyone at the Spring Shoot..!!

 

That doesn't surprise me Mark. I've gotten some really great groups with 55 grns and .020 teflon patch.
At the moment, my front sight is too short to work with loads in the 55-60 gn range, but I might pick up a new sight in June and work on it.
I ordered 2 new ones recently to try, but the supplier sent the wrong ones. It's getting too close to the Spring shoot now, on top of everything else I have going on, to start over. I'll shoot what I have, and maybe perhaps get something else for September.
See ya'll soon..!!!

For what it's worth, I just got home from the State table shoot in Indiana and with the 60 gr charge I spoke of shot a 3.4+ string yesterday. Today's string we won't discuss.
Mark