I'd recommend looking around at any local leather crafters and give 'em your specifications. Also, there's a gaggle of cowboy action shooters suppliers that mat have what you want. Use your google-fu and look around.
Be advised, a good, quality gunbelt will cost a few extra bucks BUT, it'll make a WORLD of diffrence!
I rode roughstock in college and I understand your situation a little bit. My All Around buckle has occupied a few of my belts.