The only new factory bolt rifles in DGR calibres that have not given me feeding or ejection problems are the
Blaser R-93, and the Weatherby Mark V.
Many rifles feed with non belted standard '06 sized cases.
But when the cases get "fatter" and/or belted is when you have problems. Neither one of my Whitworths a 375 and a 458 were reliable.
I have seen several other high dollar custom rifles fail to work, which is why I went to double rifles for dangerous game.
I have discovered I like them for almost all of my hunting.
When I want to use a bolt rifle I use a Rem Mod 7 in 308 or a Blaser R-93, for which I have several barrels from 223 to 375 H&H. I have never had a single problem with a Blaser.