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Ben, the maker - Blackhawik only states that 12ga shells are "held securely". I would ask them directly if 20ga shells are usable at Phone: 406-284-3840 or by email inquiry here : https://blackhawk.com/help/contact-us

20 ga shells will be to loose to be "secure" in the loops it will work but 20 ga shells may fall out if you are doing a lot of "moving"