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Message: <blockquote data-quote="Mad Professor" data-source="post: 3319852" data-attributes="member: 5316">I think you may mean .380 auto bullets. They are still .354-.355” like the 9mm bullet but are usually 95 grain. You will need an aftermarket guide rod and spring(s). You need a bushing/adapter if your 17 is a gen 4. There is not a minimum power factor in Steel Challenge like there is in some disciplines. The lighter bullet by itself will produce less recoil.  Usually a powder is increased with lighter bullets to generate more recoil to cycle the gun. That is not the goal here. Instead, reduce the recoil spring. Look at .380 load data for charge weight. And compare with the same powder for a 9mm 115 grain bullet. You will need more powder than .380 because if the 9mm case. For instance Hodgdon data on Titegroup is 2.7-3.2 for 380/95. 9/115 3.9-4.3.  I’m not suggesting TG is the best to use for low load but it would work. If I was trying it, I would try 3.0g with the 95g bullet.  Then go up or down as neededIt won’t cycle the Glock with the stock recoil spring. But shoot it and see what it feels like. Then reduce the spring until it will cycle. The factory spring is 17lb. I’d get 11, 13, and 15 springs. Reduce it until it runs and the slide locks back.</blockquote>