Nitrox

I am with you all the way with the vintage double.
Drake has a nice selection and one could always try to make a deal with them.

They have a nice Army and Navy .600 NE for 45,000 $ and I think that if you slaped them over the nose with a boundle of 1000 $ bills they would come around.

and sel the rifle for 40,000 $
http://www.drake.net/html/vintagerifle.html

Cheers,

André