Savage actions are the same 10,11,12,16.... the only difference is with the older styles staggered feed and the newer center feed action screw spacing. Staggered is 4.25" and center feed is 4.40". The center feed models mag will stay in the stock when action is removed as well. It does come out, just not part of the action as the staggered feed is.

The target models and lrpv's are large shank as well as the magnums I believe.

Stevens actions are the same as the small shank actions but dont have the accu trigger are'nt available in stainless. Welcome to the forum, Bill