Did you bed the tang also? I would and did on my Montana and what I found is that I simply hand tighten as tight as possible and not worry about it. I don't measure torque and the rifle shoots great. in my opinion, when you combine the high quality stock of the Montana with great bedding material (I use Devcon 10110 mostly) compression issues simply vanish. YMMV and it looks like you are off to a good start but I would give the tang a good once over before you bolt it back up.
