So after many frustrating attempts over the past 12-15 years, I decided that todays shooting session would be flint only. I went with a friend who only shoots flint and wanted to do likewise, and possibly get some advice if needed. I didn’t shoot great, likely only about 40% or so hits on targets (trail walk), and found myself flinching still quite a bit, but worked very hard on holding through and followed Zoni’s advice on focusing on the front sight only. It helped a lot and allowed me some decent hits on fairly tough targets when I was able to hold through the flash.
Perhaps there is hope for me yet?!?
Walk
Like many other shooting disciplines, much your solution can be handled off the range. Lots and lots of dry fire. Teach your brain that the search breaking and the hammer hitting the frizzen is no big deal. In dry fire you must maintain proper form, full focus on front sight, good clean trigger squeeze, and breath control. You are building muscle memory here, you are training your muscles and mind to make the shot, without the noise, recoil, and in the case of a flintlock, the pan flash.
Start with a wooden flint. Several times a day pick up the gun, sight in, and "make the shot." Even if it's just once, if it was perfect put the gun down, come do another one later. Occasionally do 2 or 3, eventually 5, but all need to be perfect, don't put a bad shot "on your harddrive."
Do this every day.
After a few weeks of this, when the dry shots a pretty much always perfect, and, If you can get away with it in your yard, a couple times a week go do the same thing but with a flint in the jaws and a little 4f in the pan. Ideally do it once, then put the wooden flint back in and do a bunch more shots with that, then 1 more with just a little pan powder and real flint. Progress slowly to more and more primed pan shots in a row, alternating back and forth. Having a friend or spouse who can alternately prime or Not prime the pan, so you won't know which you are getting, is a huge help, but this is a long (and tedious) process.
Feel free to p.m. me for more details or questions.