I may be wrong, but I think all of those mini-sharps are private labled for various outfits by one of the euro-replica makers.  Maybe Pedersoil it one was lucky.   I saw one in 357 mag (pistol) that I'd have grabbed if I'd had the cash, more as a fun-plinking gun.   I have a lower grade (IMHO) replica sharps carbine in 40-50 BN BUT it is full sized.   

  Not sure how much pressure but here is a link to the Chiappa site.
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the factory ships it in .218 bee,  .30-30 and .38-55 Win.      higher power than I'd have expected

Catalogue has them starting at 1595.00

According to Phil Spanburger (sp?) Chiappa is the manufacturer.  On the Lyman website they make no mention of the mini-Sharps, only the full sized 45/70 version.  Perhaps it was not as good a product as one can hope.  I did read a review of one where the chamber was so tight that the block shaved the rear of the cartridge and then couldn't extract it.  The manufacturer was less than helpful.