there is a way to polish the bore of a shotgun. you might think yours is clean and shiny...till you polish it.

i cant remember the exzact directions...but you need green and blue (non scratching..i had trouble finding it..think i found it at lowes) scotch bright..and oil. i think i used wd-40..think it was recomended i cant remember..then you attach a cleaning rod and a bore brush(think i used a 20ga in a 12ga) to a drill. i put the barrel in a padded vise. left a choke in. oiled the green scotch brite(i think 1 inch square or so..and got it in the chamber and fired up the drill..i think you run the green for 10 minutes changing the scotch brite and keeping it really oiled every so often. then 5 minutes of the same with the green. cant remember if thats 100% right or not. someone should know...its supposed to help density..i dont know if it did or not..i bought a new choke after i polished the bore lol. but it was SHINY..chrome shinny..when i THOUGHT it was shiny before..