Pat C,
You always get a little leading with standard lubricated lead bullets. Many say the new powder coating approach stops it, but I've been so busy I've had some of the powder sitting on a shelf for two years until I get time to try it, and still haven't.
I've fired up to 3000 rounds of lubricated lead bullets through my 45 Auto and it got a little leading at the throat early on, but it then stopped growing. This is largely because that bore is almost glass smooth.
At the other extreme, I have a couple of revolver barrels so rough that they lead to the point accuracy is deteriorated. These have to be cleaned of lead.
Though it has been done for generations, at this point in time I recommend against the practice of firing jacketed bullets after lead to clean a bore. Gun makers recommend against it. They have measured the pressure increase that results and a few destroyed guns have been documented. It's rare and not a huge risk, but one not worth taking when you can avoid it altogether. I've proven to may own satisfaction that the lead is merely spread out and burnished by the jacketed bullet and not scraped off or removed. This leaves the whole bore smaller in diameter than it originally was, raising pressure. The burnishing action flows the lead like thick grease, raising pressure for the jacketed load even more.
Revolvers have the added issue that many have throats as small or smaller than the groove diameter of their barrels. This can cause a great deal of leading by gas cutting. Revolvers also commonly have bore constrictions where the barrel screws into the frame. This has the same effect as the small throats. It makes the bullet too small for the rest of the bore and bypassing gases cut the lead and splatter it onto the bore.
The idea that shooting softer bullets will alleviate leading is based on the soft bullet being upset by gas pressure enough to go back out to bore size after passing through a tight spot. When Joe Brennan's book was still hosted by the LASC site, one of the contributing authors said he found this worked, but only
after getting the bore smooth. He had a regimen of using a bore mop to coat the bore of a revolver with JB Bore paste and shooting a light cast bullet loads through it, then repeating, I think a couple hundred time, but I've forgotten the amount. The end effect was to polish the bore surface. He said the soft bullet cure didn't work before doing that but that it did work afterward. He still had a constriction (JB can't remove much material) but the bullet bump-up post constriction seemed to work once it was polished.
Personally, I prefer firelapping to that JB method for this kind of thing. You can search the forum on that subject, but I can verify that both leading and copper fouling build-up can be greatly reduced by smoothing the bore.
Other methods of removing lead are mechanical, chemical, and electrochemical. Taking the last one first, there used to be a device called a Foul-Out made by Outers. It was never a big seller and they dropped it from their line some years ago.
Father Frog's site has do-it-yourself instructions, but you have to mix chemicals and do some soldering.
The chemical method I've found works is
Sharpshoot'R NO-LEAD. You wet the barrel with it and leave it for an hour and it reacts with the lead to form a black compound that patches right out. I've heard a couple of folks complain about its shelf life. I've had no problem with it so far.
The mechanical methods are to scrape the lead out with something that can't hurt the steel bore. The commercial device for this is called a Lewis Lead Remover, sold by Brownells. It uses patches of bronze screen to scrape lead from the bore surface. Many folks just wrap a strand or two of Chore Boy brand copper scouring pad around an undersized brush and scrape it out with that. CAUTION: a lot of other brands are copper-plated steel pads. These will scratch a bore. Use a magnet to test for steel underneath if you are uncertain what you've got. Look for "100% Copper" on the label, or stick to the Chore Boy brand.
Both of those mechanical methods work best if you apply a
penetrating cleaner (that brand is a penetrant and does not react with copper) or a penetrating oil like
Kroil and let it sit 24 hours first. The penetrants get under the lead so it pops out more easily. Again, the smoother the bore, the easier this is to do.
The last mechanical method is to employ one of the lead removing cloths. I have mixed feelings about these. I looked up the original patent and they use 400 grit aluminum oxide abrasive. This removes lead, but it's slow. I permanently marks aluminum. It polishes steel. It occurred to me long ago that you could smooth a muzzle loader by firing balls patched with this stuff, and pulling it through a bore from breech to muzzle won't hurt and will tend to polish the bore or cylinder throat you push it through a little. I would avoid starting it in from the muzzle. It's probably too slow cutting and too embedded in the cloth to funnel a muzzle, but the idea just bothers me. YMMV.