Given the lower cost of 9mm ammo over .38 special, and ease of reloading with moon clips, why aren't more revolvers chambered in 9mm? - Quora
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Revolvers Only: Moon Clips: .38 Special vs. .45 ACP
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Do all 9mm revolvers require moon clips? - Quora
Full Moon Clips | Clark Custom Guns
Moonstruck: Using Moon Clips for Rimless Revolver Reloads