75% was when he's buying a gun he wants / is confident he can sell it after the 30 day wait .... I think you're right on a loan / I don't think he goes over 50%. But on a few premium guns / I've seen him go as high as 85% of what he knows he can sell it for .... for a good clean gun that is virtually sold the day it comes out.
But he's an unusual pawn shop ... probably 75 shotguns in stock ( Perazzi, Krieghoff, Browning, Beretta etc ), about 25 1911's ( Baer, Brown, Kimber ), probably 200 misc handguns Sig, Beretta, S&W, Springfield, etc - and easily 100 rifles ... Its my favorite toy store / and he'll order whatever you want from Wilson Combat, Sig, etc .... and a nice family run operation. For repeat customers he likes - he'll often sell at 10% over his cost on special orders / prepaid of course.