Then he told me that all the brass that hit the floor would belong to him,
At that point, I would have told him that rule just cost him a customer. And why. My brass doesn't become his brass just because it touches his floor, any more than my shoes become his shoes when I walk in the place, or my car become his car because I park in his lot.
At least, not until I abandon them, on his property. THEN he has a legal (and moral) claim, but not until then!
I MIGHT consider his range, and his rules, IF he deducted the value of my spent brass from the cost of the range rental.
I MIGHT consider his range, and ONLY shoot revolvers...
I absolutely would not consider his range if I am shooting one of my "wildcat" pistols were no commercially manufactured ammo is available. When I have spent some time (and time=money) trimming, forming and reaming brass to make cases, he can go pound sand if he thinks I am going to give them to him, and pay him for the privilege just because they land on his floor!
If I didn't reload, or all I shot was non-reloadable ammo, I probably wouldn't care much. He's welcome to all the rimfire cases and berdan primed cases, and even reloadable brass
that I leave on his range. otherwise, its my property, and I'm not going to agree to just give it to him.
It's his place, and he can make whatever rules he wants there, I'm free to, and quite willing to go elsewhere.