I have a William Douglass in a 470. I think they made a few in a 500. You might find one if you look around. The Douglass have gone up in value. I think you could still find them in the 15 range. 5 years ago you could find them for around 10K, but the last I saw new guy had one for about 13K. I would not part with mine for 15K. At 9 1/2 lbs it balances perfect. Good luck