A friend of mine has a Texas Brigade Armory rifle for sale on the Hide built on a 721. Here's the link:
FS Texas Brigade Armory .300WSM long action - Sniper's Hide Forums
The 721 is the predecessor to the 700 long action. They were made from 1948 to 1962 (give or take a year or two). Had a few bolt issues if I remember correctly. I think with broken extractors but not sure. The fix is to just buy a new PTG bolt to fit and voila, you got an up to date action. Oh and drop in any new trigger too.