After my old 41 Long Colt New Navy 1892 encountered a cracked forcing cone I had my gunsmith rebuild the gun into a 38spl using a .357 new barrel and a cylinder from a 38 Long Colt. The gun is now functioning better than it ever did in it's former dress, however the new cylinder has rather large cylinder throats. Three are at least > .374".
While the gun is capable of excellent accuracy I am getting significant leading in the first half inch of the barrel. I attribute this to gas cutting. I am usiong very light 38spl loadings ie 3 gr of 700x under a .358 SWC -Lyman 358477 bullet. cast from WW.
I am thinking casting the bullets out of pure lead might help along with applying GC's to the base of the bullets. I hope I am not barking up the wrong tree here but look to you guys for guidance.
This revolver is deemed to be an antique up here and is not considered a firearm under our Criminal Code. I think our definition of an "Antique Firearm" is the same as yours in the US. Because of it's status I am limited to what I could do to retain it as an antique.
Thoughts/
Take Care
Bob
BTW because it is an antique by definition our stupid gun laws do not apply to it which makes the gun rather valuable up here as an antique.