I know 2+ years ago he had a .500 he had built for sale. I think he had taken it back in trade on something else if I recall what he told me correctly. It was heavy. I later saw it in Dallas and it looked like a .577 or .600 frame.

I am guessing this one is pretty normal for a .600. If he had it for sale earlier he never told me, but that doesn't mean anything either.