Suggest you don't,
As others have mentioned there is a minimal gain, I recall a couple articles (Kenny Jarrett as I recall) where PO Ackley himself felt the 280 AI was the only one that really was worthwhile,
If you have to have one (I know the feeling as I have a 280 AI) I suggest getting a Remington donor action, generally easy to find and relatively cheap and getting it rebarelled, more money but you wont regret changing your rifle
Whatever you choose good luck and have fun,
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