If the action screw spacing you've given is correct, it is not a stagger feed - but it is a center feed model (another way to tell is when removing the barreled action, SF models will have the magazine shell attached to the action itself, where the CF models do not.
Now... turning you direction toward stock selection. I assume you are meaning some sort of bedding block (inbuilt 'cradle') version in a tactical model with blind mag - correct? If so, here are some choices:
#1 - Bell and Carlson Medalist
#2 - Choate: Ultimate Sniper (#22-06-15) and Tactical Custom (26-06-02)
#3 - Manners MCS T2 (and T2A - Adjustable cheek riser) and T4
#4 - Stockade (Kevin Rayhill) Prarie Dog Special/Tactical
Those are all I can think of that meet ALL of your criteria (as I understand it anyway)...
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