Sendero, I'll say in my experience the RCBS rifle lube makes better alloy reducant than it does bullet lube, but that's true for a large number of the commercial wax/oil concoctions sold as bullet lube. I'll also say that I can't speak for your rifle's preferences, or your unique set of components and reloading techniques, so the best policy (especially since it's in your sizer already) is to go ahead and try it to find out for yourself. Since you have the other stick, do you know if it's the rifle, or the pistol version?