Round back . Long action, Allen screw bolt , stagger feed blind mag .
Probably a small shank as it has the square slotted B nut . Looks like the 2 screw trigger . So 92-05' 110 . They are all 110s even the 111,112, and Axis . The mag box looks like it's compatible with all of the 2.5" length cases . I can't tell you any more than that from the pics . If it was a magnum it was probably a 300WM but it looks more like an 06 family rib on the mag box .