99's aren't like 110's, you can't easily swap the barrels. For that matter, I don't even know of any gunsmiths who will take on the hassle of making/fitting a new barrel to a 99.
Do yourself (and your classic 99F) a favor and get yourself a cheap Savage Axis to convert into a 6.5 Creedmoor if you really want one. You won't ruin the value of you're 99, and the price of the Axis and a pre-fit barrel combined will likely be less than you'd have in getting a custom barrel made for you 99 - assuming you could find someone to do it. And the best part is you won't have to worry about any magazine feeding issues.
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