Re: Winchester Model 70 220 Swift-
If the rifle you're looking at is a Model 70 SA "Heavy Varmint", as stamped on the barrel, it is a good one. The one I own is in .243 Win and is the most accurate rifle I have owned in this caliber, and I've owned several. I bought it used in Kennewick, Washington for $500.00.
The 3rd handload out of it, Winchester 85gn HP Match bullet, 44.5gn of IMR4831 and BR2's, produced a .267" group. In fact, the only bullet that hasn't shot well from this rifle is the 70gn Ballistic Tip, but it hasn't shot well in two other .243's either. I thought it may have been a barrel twist issue but it shot the 65gn V-Max in to .3-.4's.
In November I loaded up the 95gn Ballistic Tip with 44.0gn of Viht N560/BR2's and again it shot .2's. Can't ask for much more from a factory rifle. I took a groundhog at 580yds with this load.
The stock on mine is like uncleb's, a HS Precision with wide forearm. As for the bolt, I think you're talking about the recessed portion where the cartridge rim fits in. The brass extractor just pops over the rim upon closing the bolt.
The trigger on mine is excellent. Definately no need for an aftermarket. I adjusted it down to 2lbs and it breaks crisp with no perceivable take-up. Great rifle all the way around, I think. JohnnyK.
"The pleasure you get from life is equal to the attitude you put into it."