Thank you for the feedback. I am only 63 years young but I have changed my lifestyle and have lost 115lbs since April. Have lost weight everywhere and feel better than I have in 40 years. I have lost most of my insulation and padding if you know what I mean. We do change as we age, I have several African rifles that thump on both ends as well as a 50 BMG that burns 230gts o powder behind a 750gr bullet. I don't like them anymore! I am getting softer!Same here, I am 76, I use a Past recoil pad when I am sighting in my bigger bore guns, My .72 smoothbore really rocks me with a 100 gr of 1F and a .700 ball. With the pad (the thickest they sell) I don't feel the recoil at all.
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Sometimes percussion guns that don't go off need a new nipple or the nipple fit is too tight. If the fit is too tight, chuck the nipple up in a drill and sand the diameter down to where the cap slides on easily but won't fall off if you turn your rifle upside down. If the nipple is mushroomed you can take that off with a small file while your nipple is chucked up in the drill as well. I think GPRs takes a metric nipple. TOW would have them.
Lastly, I don't know if you take the barrel off and dunk it in a bucket of water to clean it using the cleaning jag and a patch to pump water out the flash chamber. If you don't, perhaps the chamber is cruded up making ignition so-so.
I have 3 days to hunt for whitetail doe with the GPR and do not have a spare nipple for aback up so I may wait to mess with it. Depending on my hunt in the morning I may chuck it up in a lathe and take a couple thousandths off and see if that works.