I`ve a 1999 Montana action with one of their barrels chambered for the 6.5x284.
Personally if I was to do it all over again I`d stick with a 6.5 Swede, Improved form if I wanted a little more zip. The Swede and 260 Rem are only ~ 100 fps behind the 6.5x284 with same wgt bullets and pressures, plus brass is much less expensive and easier to find.
That said there is such a thing as "want" and I understand it very well....