You're right...! The seller is either terminally dumb, because he doesn't know how to express the caliber of the rifle properly. And, he doesn't know what the proper name is for cast bullets. Or, he could be a crafty criminal trying to sell something and lying about what the product is...!
I tried to register on GunBroker, however, they want a credit card number to register, and want to charge one dollar a month on the card... I'm unwilling to do that...
I think these people, GunBroker, are as phoney, and as greedy, as the seller of this firearm apparently is...
Bill