10 gauge bandolier

[6pt-Sika]

It might be a good idea to call or email Buffalo Arms . They might have such an animal or can tell you who to contact to make you something along those lines .

[Larry the Gun Guy]

Here's something that popped up today on GI.
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https://www.gunsinternational.com/gu...n_id=101621998

[Bill Murphy]

I've never seen a Mills bird belt in 10 gauge, but they can probably be stretched when wet. They are a great shell belt. The other pictured belt looks like a Parker belt.