I believe the .450/400 NE in the Ruger takes a .410" bullet. I looked at that too, and the chambering seems like an excellent choice - mild recoil and effective - but it is only available in the 1H, which is 9lbs.
I didn't have an issue with recoil in my .416 RM - just over 10lbs with scope, nor with any of my .375 H&H's - including a No.1, but they were a bit too heavy for me. (before anyone suggests I hit the gym and turn that mush into muscle, I broke my back in an accident, so I'm about as muscley as I'll get). That is why I was thinking about the .350 RM as a parent case in the other thread.
Boomer - what do you mean by: "There are other top PHs, but the PH banner is applied too loosely in my opinion"?