The only factory specs Remington 700 cataloged in 8x57 was the 2004 700 Classic. $400 is a very fair price, I would buy it. My own Remington 700 in 8x57 is a parts gun with a 700 Classic barrel and it shoots a variety of bullets quite well. If you're a reloader there are lots of good bullet options and Fed/Rem/Win brass might be a seasonal production item, but 200 cases will probably last you 2,000 shots down the tube.

JEff