I remeber lapping the barrel of a marlin 94cl 25/20 late 80s vintage that just wouldn't shoot. I cast an in barrel slug around a .22 cleaning brush, removed the lead slug, cut a couple of grooves around it to hold lapping compound. lapped the tight spots out where the sights were cut in and towards the chamber. Got it all the same with no tight spots and a shiny mirror like finish. Gun still wouldn't shoot. Haven't had the urge to lap a barrel for the last 20 years.
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