The MARK V action is a outstanding action,you can hear crap about any gunmaker and problems,it's the stinkin internet.I exceeded velocities I ever thought possible with my 338-378 and all were safe loads within the range of published data.I have also owned several 340's, 30-378's and a couple .378's never a single problem ,never sticky bolt lift nothing, firing alot of ammo.I believe it's probably the safest action out there.
