I just got a lee six style stock made by Joel Russo today
PICTURES man. I've got the same stock on my Striker, it is sweet.
I think the 260 would be fine out to 600, maybe a little anemic for deer on the far end but fine with good placement.
I don't know what to say on scopes, I put a Burris 3x12 on mine because I have no brake and it comes straight back about 3 - 4 inches when fired. Some folks, especially those with brakes, shoot regular rifle scopes and seem to like it. Just seems to me that would take a little getting used to.