decoppering agent

decoppering agent

[dē′käp·ə·riŋ ‚ā·jənt]
(ordnance)
Material, such as finely divided tin, included in a propelling charge, or inserted in the chamber with the propelling charge, for the purpose of removing the coppering from the surface of the bore.
References in periodicals archive ?
Tenders are invited for Decoppering Agent For Charge 8 & 9 Drg.
It's a clean-burning, temperature-resistant ball powder that meters easily through small case necks, and also includes a decoppering agent, nice when shooting hundreds of rounds a day.
However, post-war powder manufacturers apparently didn't see copper-fouling as a concern for civilian shooters, who unlike soldiers had plenty of spare time to clean barrels, so most new powders didn't contain decoppering agents.