Are you using a brass jag and phosphorus bronze brush? I went to an aluminum jag from Dewey to eliminate the false blue readings. If you have a bore scope you should be able to tell if it’s clean or not. Phosphorus brushes will give out false blue readings also. Get a Teslong Bore Scope and it will surprise you about your cleaning but you will be able to see if it’s really clean or not. Used to look down the bore and see a bright clean barrel, bought a Teslong Bore Scope and was really surprised about the clean, bright shiny barrel that was still not clean.
