I’m responsible for cleaning pool shotguns after 400-500 foster slugs through each every qual cycle. The leading is terrible, although I can’t say if accuracy is degraded much given the human variation among shooters.
For cleaning I like to fire a couple rounds of steel shot while the barrel is still hot and the lead malleable, as is seems to knock the worst of the lead out. If that’s not practical, then run the barrels in the heated ultrasonic for about 10 minutes. After that, I run a bronze brush wrapped in copper chore-boy for a few minutes while wetting the bore with Lucas ultrasonic solvent. Our barrels are improved cylinder, which makes the last inch or two at the muzzle a real pain in the butt with heavy leading.
Anyone know of a 12g Lewis Lead Remover tool?
ETA- Rem 870P with ghost rings.