Custerman: Must admit that black powder is corrosive. However during WW 2 it was not the powder that was corrosive. Quote: "Since this was your first time shooting, I would check to see what type of ammo you were using. As noted, any WW2 surplus ammo but may contain corrosive powder. Another thing to think about is the material of the bullet. Most military ammo was steel jacketed."". Actualy it was the primer only that was corrosive. The only U.S.G.I. cartridge not corrosively primed was he .30 cal
M-1 carbine cartridge in WW 2 (with possibly some .38's). Most of the bullets were not steel jaceted but cupro nickel or copper clad lead. Even the Armor peicing ammo was so clad with the tungsten nickle insert for going through armor. (from tThe U.S.G.I.he 30-06 up to the .50 cal MG). Same as the tracer, it too was copper jacketed. I am talking about the U.S. ammo in WW 2. Corrosive priming for U.S.G.I. stopped in the
mid 1950's, some sooner on certain manufacturers and lots. (usually about 1954 or earlier. I have a list of when and what if interested.