Unique priming formulation delivers hot, uniform powder ignition Noncorrosive & nonmercuric #10-for revolvers w/No. 10 nipples. In ribbed, soft copper cups #11-will ignite hard-to-fire loads. Foiled & lacquer-sealed #11M-hotter caps intended for rifles & revolvers w/No. 11 nipples. Charged with a magnum mix to reliably ignite problem loads Case lots only.