If using bp or substitutes you need bp lube for the fouling or there will be a setious mess. Coul lube the coated bullets or use a lube cookie.
I'm using powder coated in some antiques wirh smokeless but haven't given any a really deep bore clean yet. Will be looking for signs of coating being scrubbed in rough barrels when I do.
I shoot several BPCRifles in 38-55 (2) 40-60 Maynard, 40-65Win., 40-70 Sharps Straight, 45-70 (6) 45-90 and 50-70. I shoot 1-20 tin/lead alloy, powder coat everything and lube with Paul Matthews' Premium lube. Never a leading issue! I conducted a test awhile back with the 40-65 (55 grs 2Fg. 400 gr Snover bullet) I fired 10 rds per target on 5 different targets for a total of 50 shots, without cleaning or wiping between shots. No appreciable loss in accuracy, fouling was minimal and soft! Easily removed with a few patched dampened with "Moose Milk"
I can't speak to pitted bores as all my rifles have pristine bores.
YMMV!
Those are all true black powder guns?
Ya, I had an opportunity at a rare 50-70, original, I don't buy guns to leave them in the cabinet so I will make it a shooter, ha ha.
Several are custom builds, a few reproductions. Only the 50-70 is an original Rolling Block. I shoot and enjoy them all equally!
I shoot powder coated and bp lubed bullets out of my 1873 trapdoor and work very well. They are bp bullets with big lube grooves though.
I use PC slugs in a few old original barrels that have varying degree's of pitting. I shoot them at BP equivalency loads loaded with smokeless so BP fowling isnt an issue but neither is PC fowling or leading in the bores, basically i have never noticed even a skid mark in any of the bores. One of these rifles is an original 1886 in 45-70 that ser #'s to 1887 and has what would be considered a "very pitted bore" on its best day and that old girl will shoot PC slugs into 2" or less all afternoon, I was amazed when I bought the thing that it would even stabilize a slug let alone shoot hunting accuracy.
Ok, so you are shooting true BP. You powder coat your cast bullets, then lube them with BP lube, load and shoot.
I wouldn't powder coat them. Maybe in a modern rifle shooting smokeless. It's way too far from traditional for me. If after using the correct alloy and lube I couldn't solve a leading problem, then I'd paper patch the bullets. Paper patching is a nice, and traditional, way to prevent the lead from touching the bore. Plus PP bullets are cool
Chris.
There is no reason to shoot powder coated bullets in BP cartridge. There is no advantage for leading because of velocity and you need to lube the bullet anyway
The only advantage might be to gain some diameter if you are using a bullet that is too small.