repeater actions for 416 rigby and larger

[ARlife4me]

my search only came back with stiller and dillon, but not in repeaters? the rigby bolt faces are easier to find (well for me anyway). for the 375 and up calibers using gibbs and ? faces is my query? looking for options that are NOT single fed. is there a minimum bolt diameter best for strength (ie, .750 vs .800+)? possibly more question too follow?

 

[MagnumManiac]

The best repeater in 416 Rigby and larger are the CZ 550 Safari Magnum actions.
I have 3, one is plain Jane 416 Rigby. The other 2 are highly modified switch barrels to utilise my 416 Rigby Improved cartridges in 30, 33, 37 & prototype 408. These 2 have been made into single shots so I can run 4.1"+ rounds through them, rear bridge, ejector blade and internal milling so loaded rounds will eject.
These are no longer made, but are still cheap enough on the used market. Barrels don't need extractor cuts, makes it easy to use shouldered barrels.
Other than those, Borden makes the perfect action size and bolt diameter.

Cheers.