i have had one in the back of the safe for a while that i have forgotten the build date i haven't seen it for a little while.i'm looking at building a .470 nitro on mine walking around the antique gun show with the old man about a year ago we began talking about future project's we wanted to have built and as i have a 9.3x62 he suggested i go bigger again and the .470 nitro came up.im having the conversion done by a family friend john clapham who i know has done some work for robert borsak and has done my 601 convert to .243,my m77 to .204 and some work on my m77 .270 which i am over the moon with i would recommend him to anyone