RE: 721 in a 700 stock?
Yes, that will work. A few months ago I put a synthetic stock on a 721 in.270. After looking for and not finding a stock for a 721 I was told that 700 stock is very close. It worked out very well. All you have to do is relieve the barrel channel where the barrel swells for the factory sight dovetail and possibly ( I can't remember right now ) a little around the tang