These FHF ammo sleeves are perfect for holding extra 410. Comes with belt and pack attachment options.
Fits great on the EZ no drill gun sling too.
(https://i.ibb.co/71037MT/3762-C110-3805-4-C4-A-BAF1-8453-EDC3-DCB1.jpg) (https://ibb.co/2kpzXVL)
(https://i.ibb.co/wsH84Ch/718-E9-D5-E-F3-C2-4022-BAF6-AD9-FE4272337.jpg) (https://ibb.co/4dyCpMR)
(https://i.ibb.co/bK1XVdp/B1402837-EAF5-4-BCB-8-BF2-7-AD10-C2-C1-FD0.jpg) (https://ibb.co/d5BDvKn)
(https://i.ibb.co/31bTptV/0892-A6-E9-45-D9-4434-B86-B-3291-D11-CBD3-A.jpg) (https://ibb.co/zsgmXKC)
I got an Allen rifle sling at Walmart with 3 bullet loops that work perfectly for .410 shells.