Roger, I'm reminded of the late Pete Bloom who found a pile of bullets in a block house on the Western Front; somebody had evidently snapped the pullets off fragile brass cases and had made a small fire utilising the cordite.
Pete bought the bullets back to blighty and cleaned them up in his media tumbler, after reloading them in good brass he shot the lot during the NRA summer historic meeting in his smellie and wrote up the experience in Guns Review.