I try to shoot a flintlock as accurate as any other roundball rifle. Or in the case of my GPH any conical shooting rifle with open sights. I TRY for 4 inches at least at 100 yards, and 2 inches at 50. At 25 yards I like to stack them. Now this is off a bench rest. If you made me shoot free standing.. all bets are off.
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From the bench with my .54 Great Plains I can get one big hole of an inch or less for five shots @25 yards, all into two inches or less at 50 yards, and "mostly" under four inches at 100. Haven't shot it farther.
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I do like the idea of shooting different targets though. Using .50 or .54 ball they make a big hole to start with and make it real hard to determine your group size. Maybe using a five target page and five shots then measure the deviation off the bull for each.....
HA
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Huntaway, I'm following your experience as it relates to mine; expect to have a range session today-probably 50 yds, to determine how 85 + gr 777 works out.
I do wonder re: the flintlock; my caplock sends more "crap" into my eyes than any ML I've ever shot previously. Two new nipples are on (back)order; in the meantime I am squeezing the base of the #11 caps for a tight fit-what is the case w/ your pan?
The broadside of the neighbors barn would be acceptable to me. I am still having trouble holding steady during the flash-bang. Now my caplock on the other hand I'll lay that next to anything out to 75 yards or so. My resolution this year is to learn to shoot that flinter better.
If you flintlock is going flash bang, it's not built properly...There should be no noticable delay when shooting a flintlock...Check to make sure the touch hole is coned from the inside and located at the sunrise position on the pan...
I always wear glasses when shooting but nothing ever hits me in the face when shooting the flintlock.
One thing I found that helps me with shootin the flintlock is that my rifle is left handed. When I put the peep sight on it, the flash from the pan is almost entirely blocked by the sight.
I always thought if you are getting blowback from a percussion gun your charge is too high???
HA
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Work is the evil one must endure for life's pleasure's.
Acceptable Accuracy with a Flintlock
I was getting pie plate accuracy with the .50GPR. I'll have to work on that. 
