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While I was building my Uberti Highwall match rifle I inquired of the dealer what the steel alloy was in anticipation of color casing it after the factory finish wore off. He told be Uberti used 8620 equivalent alloy for their cartridge receivers which has very similar tensile, elongation and shock load numbers compared to our 4140 chrome moly alloy but was compatible with charcoal casing.Well I'm in business, I found a size/lube die I made for some other project that takes the bullet base and front band down to .448 and I can push them in the cylinder mouth by hand enough to clear the loading port before they snug up in the chamber past the mouth about 2/3rds there length as in the picture.
Now if they will seal against front end chain fire and not back out from recoil I think It'll be a good match for the gun. The bullet weighs 202 grains dry so should be around 205 grains with the grease groove full.
I do have felt grease wads that will work to help seal things up if the bullet diameter is not tight enough.
I'll be quite surprised if this bullet does not perform well .
I didn't ask about the cartridge revolver receivers but would be very surprised if they did not use the same in them as they are certified for smokeless cartridge use. The percussion guns I have no clue about so will be on my own with this bullet heavily loaded with black powder.I'm thinking it will be fine though especially since the bullet is under size to the groove diameter.