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For my 10/22's I love my H3CR range kit, which was designed and manufactured for 22 lr RIFLES and says right on it "NOT FOR USE WITH THE RUGER CHARGER PISTOL" and my GSG 110 rd drums which ALSO say on them "Designed for Ruger 10/22 RIFLES" and strangely they also say "Do not use Waxed Ammunition" but the darn things jam like crazy if I load them with anything that ISN"T waxed. I tried to load one up with thunderbolts and I couldn't even manage to get it loaded, it kept getting stuck. Then I loaded it with waxed CCI blazer and it loaded right up with zero difficulty, go figure.