[Chuck S]

What are you shooting and in what?

Mildly corrosive is like mildly pregnant! You must remove all the copper from a raw steel bore or the corrosive salts will be plated over but will eat the steel underneath the copper plating.

Chrome bore eliminates most problems with mildly corrosive ammo.

-- Chuck

 

[Chuck S]

If the ammo really is corrosive you need the Old Army (or Old Corps) cleaning method of every day for a week, using an agressive copper solvent. Getting the copper out is paramount as it's plating over the corrosive salts.

The small amount of ammonia in Windex will get the salts out, but is unlikely to get the copper out.

This much scrubbing will probably add more wear to your rifle than shooting it.

De-coppering a barrel that isn't using corrosive ammo isn't necessary. Copper "fouling" is self limiting and seldom causes any problems -- assuming this isn't a bench rest rifle.

Try to determine if this stuff is corrosive. US Military stopped using corrosive primers during the Korean War.

-- CHuck