Had my first chance to try swaged round balls in my Huntsman this morning. The range is still deep in snow, but paths have been cut to the rimfire and muzzleloader range, and so I got to burn some powder this morning. Fired about 15 rounds, with charges ranging from 50 to 70 grains of Pyrodex and TC pre-lubed patches.. With open sights at 25 yards and a partial rest, I got 2"-3" groups using standard Remington 209 primers. Federal primers were the only other brand I had on hand, and they were terrible. Shots went all over tha place.
Next trip, the snow will be more melted away and I'll have a chance to shoot at 50 yards. I'll give Winchester Triple 7 primers a try. I did not notice any rings of impacted fouling -- the barrel cleaned up nicely with hot soapy water.
There was quite a lot of fouling in the interior of the frame, which is worrisome. I scrubbed it out with wet Q-tips and used a hair dryer to evaporate moisture, then applied Rem-Oil. I hope the fouling within the frame doesn't cause rust -- you can'y get at it without disassembling the whole thing. Someday I hope to have the .25 ACP conversion plug, which is supposed to stop a lot of that blow-by from the breech.