I keep reading where people say you can't tumble lube a single lube groove boolit but I beg to differ because I do and it works just fine in .380, .40, and .45 that I am shooting. I use a modified "recluse lube" formula which is a simple to cook recipe of 45% Lee Liquid Alox, 45% Johnson's Paste Wax and 10% low odor mineral spirits. Low smoke, sufficient lube for up to 1100 FPS, no leading and superior accuracy over jacketed and plated bullets from the usual suspects.