Daryl,
With other original percussion guns I have had the cap debris hit my arms (pretty hard at times), this is one of the first that does not spit.
Now, when I first made these nipples, I had the tops wide for musket caps, as the mainsprings are strong, and thought the heavier nipple would stand up better.
When I tried it, Man that Hurt! The hammer shrouds (Not exactly a hammer cup in this case) bound on the back of the cap, and though it fired it, sheets of flame and hot suff was fired forwards and burned my left arm and wrist, as it was Pulling the cap half off the nipple on detonation.
I tried it a few times with alterations and it still bit me. When I turned the nipples down for # 11's all the flame went down the hatch and I got nothing. Same with live fire, V nice and no spits at all.
I suppose these locks, made for "Imperial" caps, were some of the latest styles made, in the 50's and 60's, so they should have known what they were doing by then.
If you ever get down here you can try it out.
Also, it's very nice that if you shine a light in the nipples and look down the barrel, you see the dot of light right in the middle of the bore. A true :Central fire" like they claim! ...No corners for the spark to go around! Brilliant really.. Closer to a revolver than most percussion shotguns.
ATB,
Richard.