20 Gauge shotshell holder
thingiverse
I designed this similar to my 12 gauge shotshell holder for a buddy who has a 20 gauge and needed holders for it. He hasn't seen the printed version yet because I haven't printed it out for him, and I don't own any 20-gauge shells to test fit with, but I obtained the specs from Wikipedia and added 0.02 percent extra space so the shells will fit inside comfortably.
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