It could be that the bolt head was left over old stock, I've seen this in several rifles that had 20 yr old parts in current production receivers. Most parts are mechanically the same, but cosmetically different. Savage currently uses 3 different vendors for bolt heads and can be identified by a dimple or 2 dimples machined into the tail. If it's an older version, it most likely has the larger clearance hole for the old fat firing pin......but it sure looks like an old version to me.