I installed the nipples by TapNTool that he has altered to fit red toy single shot caps. He also enlarged the flash hole to let more flame in. I brought OE 3f , 100 red toy caps and CCI #11's just in case.
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Loaded up 6 rounds with 25 grains, .375 balls and topped with Crisco. The toy caps slip on snugly.
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They work, the gun fired 6 times. The plastic caps "bounce " the hammer and the hammer landed in between the chambers on some shots.
I did do some "mainspring swapping " a while back and the lightest Pietta springs that happened to be the thinnest, due to manufacturing variance, ended up in these guns back when I tried to make these "Bullseye " revolvers. So....with heavier, thicker mainsprings it might mitigate the "bouncing " effect . Or if I can make them hit a little heavier.
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With CCI caps , the enlarged hole blew the caps back into the action. I'd recommend sticking with the red caps if you use these nipples . In a pinch regular caps can be used in case you need to use them. I brought Pyrodex and 777 to see if the toy caps would light off subs but I didn't have time to try them.
A short video of capping off two shots.
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I have to get out and spend more time with these. It's not like the corner store has red toy caps and there's a HazMat fee to ship them, so unless you're planning on buying a lot , it's not worth the fee.
They'll work for plinking , if they light off Pyrodex P then all the better. You can pop paper or whatever without touching your stash of Holy Black or real caps, as long as you have round balls. I feel like they won't be reliable with subs but I'll try them .