If someone is interested, I have a very similar firearm, Brno ZH 204, with a 7x57R over 12 gauge, second set of 12 gauge barrels. Roughly similar condition to Dean's, but the shotgun barrels are not ported.
7x57R ammo is fairly widely available as is the brass, reloaded with same dies as for conventional 7x57 (also known as 7 Mauser and identical to 275 Rigby). I do have dies and brass that could be worked into deal.
Send me a PM. I am in Calgary
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