That dealer is certainly an upstanding gentleman - my hat's off to him.
So many dealers are bad-mouthed, that I would suggest you post the name of his business here, even though he might well have advised before the sale that the rifle was a "handloading only" proposition.
FWIW, if you're looking for a Mauser, in a modern chambering that has a higher operating pressure than the original design chambering, I would suggest only looking at "cock-on-opening" Mauser 98's, and forget any "cock-on-closing" earlier Mauser designs.
.