Let me start by stating that I have only owned factory rifles.

I have found a donor Montucky in .338 fed for a very reasonable price and am saving up to rebarrel it to 6.5 Creed.

Is there any reason I should not send it to Pac-nor for a supermatch factory dupe? Other considerations?
What specifications do I need to request? I want to shoot factory 140amax through it, then load same or 139 scenar in once-fired.

Any input appreciated, I want to make sure I am happy with the result.