Your A Bolt is bedded at the factory (It's not as nice as a full blown bed job but all mine have shot great they way they are) and the barrel should be free floated. Wrap a dollar bill around the bottom of your barrel and see if it will slide between the barrel and the stock, if it catches and won't slide then you just need to sand the barrel channel out with a dowel and some sand paper on the high spot to free float it, after that just reseal the area of the barrel channel you sanded. Like I said I doubt you'll need to do it all of mine were floated from the factory.
I shot Hornady Custom loads out of my A bolts; they were loaded with the standard interlock bullets. However, I got into reloading and my 270 LOVED the SST's and the Interbonds. If I were you I'd look at reloading with the 154 grain SST's. Those bullets are pure death and seem to fly great. The Nosler Ballistic tips are great bullets too, but I stuck with the Hornady's because they were cheaper and shot amazing.