45-120 sharps is a cool cartridge but whats realy north american as possible is the 70-150 WCF

I have a modern dummy round made by using 12 ga magtech brass. someone in germany had a winchester gun for this cartridge and made them for sale to pay back his die set. take a good solid 12 ga shotgun and make new barrels with 700 NE barrel blanks.
its a mystery for me this cartridge is still forgotten in the united states. everyone should know this by looking into COTW.