Get a savage used. If you can find one with a mag bolt head, it's just a bonus. They aren't hard to work on. I've built a few now with good results. Get yourself an action wrench and a barrel nut wrench. If you get a barrel that is pre-threaded, then buy a "Big Chubby" muzzle break. No timing necessary. They work great. Make sure you time the bolt. You only want .050"-.055" protrusion of the firing pin from the bolt face. As far as a stock, if you don't mind waiting, buy a stock from Stockade Stocks. They are very nice. The Bell & Carlson sticks are nice. You can get the A5 fully adjustable now for mag fed savages now. I had the A2, but it's for a blind mag.
Tank I appriciate the advise and that's what I'm starting to consider doing the only problem is I live in a place where guns, especially used ones, are hard to come by. I think I could do the barrel swap but don't have all the tools. I've been thinking about doing a 300 WSM. Do I have to have a special short action for a Magnum or are they the same no matter the caliber?