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bolt action, big magwell, barrel cutout dimentions look too big for 22LR to me. No markings on buttplate?
Magwell opening is way too big for a .22 (I think).
I would guess something popular like a Remington 700 or Winchester 70, etc.
Here is a web site that has some dimensions for popular rifles, maybe you can figure it out using this. If you measure the mounting screw distance and it matches one of these, you're on the right track I would guess:
http://www.boydsgunstocks.com/content/Boyds/CustomPages/FAQ_actionlengthguide.htm
Hope that helps.