6.5 PRC feeds just fine from the mag bolt and magazine. All you need is the barrel.
The one problem you might have is pierced primers. 6.5 PRC is high enough pressure to cause problems with the magnum bolt face and the large firing pin.
The solution is to have the bolt face bushed and the pin turned down to a smaller size.
Longrifles Inc. provides this service.
Some may say you are using the AXMC in ways not intended.
Not to hot rod an English product for use in America is un American to my way of thinking. Ask Carroll Shelby.