I'm not an authority on 6.5's, but I'm fairly certain any cartridge you choose (Creed, Lapua, .260, etc) when loaded with the longer VLD-style bullets isn't going to fit in a S/A magazine without seating the bullets deeper than is ideal. When I built my Axis in .284 Winchester I made the mistake of ordering a S/A stock and even with standard 140gr deer hunting bullets I'm having to seat them a little deeper than I'd like for them to feed from the S/A magazine.
Have you considered a 6mm instead? The 6mmBR and 6mm Dasher cases are both a little over 3/4" shorter than a .284 which would give you a lot more room in the magazine for the bullet. Seems all the top long range benchrest shooters have abandoned the 6.5's in favor of 6's here in the eastern part of the country.
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