I had a 460 and I have a 378 and the 416 in a custom rifle . None had or have a muzzle break. I have shot the 416 in the weatherby rifle and didn’t find it too bad. Now my 416 is another matter altogether.
You will also running a cartridge with the potential for much higher bolt thrust. Those old actions are not that strong. When the wsms came out they were setting the bolts back on some Mausers. I’ve talked to 2 custom builders that told me that.
They put 375, 404 and 416 rigby on standard actions after a lot of modifications. The 404 case is longer than the 375 case. Nether will fit a standard action as is.
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