i have always used white lithium grease made by Permatex. Never loosenedthe plugat the range or anything. Sometimes fired as many as 40-50 rounds without removing the plug. Had a problem getting the plug outa few times. Almost made my old Staghorn a one piece musket: Had to put the receiver in a vise to get it out. Think i will try loosening the plug at ther range every ten shots or so.

The breech plug of my Encore comes out much easier than the two CVAs that i own.