I agree that a three hole bridge mount may not be good enough in a .404. Interesting that every other Parker Hale .404 photo that I've seen has four holes . I use mine in Big Game Rifle Comp out to 100 metres with the open sights and its pretty accurate. its currently fitted with a German quick release side mount. I'm not really happy with that so I'm visiting my Gunsmith friend next week to get his view.