Great looking rifle! When we've done the M995's we mill the front of the action off so the bevel is gone. Then we use an after market o.s. Rem. style recoil lug.
The 6.5x55 is a great round and one of my favorites and it will shoot excellent accuracy wise. Your group is .640" - .264" gives you .376" center to center. Basically your at 3/8" moa. You should be able to tighten that up. Give the barrel about a 100 rounds or so to settle down and recheck your accuracy. Play with the seating depth as well. I start .010" off the lands but I've seen guns any where from touching the lands up to .060" off the lands you will find the best accuracy. Shooting factory ammo thru my .338 Lapua the bullets are .100" off the lands and it will shoot under 1/2moa.
Again great looking rifle and Moon builds a great stick!
Later, Frank
Bartlein Barrels