I have seen 458 ejectors jump the rimless cartridge and jam the gum so badly that a gunsmith is needed...The 416 will surely do the same...

The 416 or any rimless round is has too much pressure for a double rifle..doubles in 416 and 375 have a history of shooting off the face very quickly..Merkle is getting a lesson in this and last I heard were going to drop the 375 and 416 from there offering...

A double cannot and will not take the pressure of a single shot such as the Thompson or Ruger...doubles are in the 14 ton catagory, that is 28,000 PSI...thats not a lot of pressure...The 375 and 416 operate at considerably more pressure than that...both can operate at 60,000 PSI...