copper equilibrium

A bore scope is what we use in centre fire . Takes all the guess work out of it

A good copper solvent will quickly tell you if you have a copper problem in a centerfire. Just wrap a white patch around a nylon brush and put it through the bore. If it turns blue, you have copper.

Cost of copper solvent versus cost of bore scope ... and the copper solvent test is definitive, no guess work required.
 
I used to think that , until I bought a bore scope there are a lot of times when the patch will not show it but there will still be copper on a land just before the muzzle( for some reason it's usually a bottom land ) , this may not be an issue for long range but it's an agg killer in short range ,(throws shots ) , if your comfortable with the patch system and It works for you that's great , everyone needs to do what they think is best for their program .at big matches the bore scope is on the cleaning table and we share it,
 
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