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...On the other hand, a DG PH has a "vital" role of being ready and able to stop a dangerous situation like a close in charge and to do so in seconds (or less).... So the whole discussion of "stopping calibers" is really a discussion that should be for the PH's.... The client (me for example) should bring a legal and effective gun/caliber that has been practiced with a lot and he/she can shoot accurately and as quickly as possible...
I disagree partially. I agree that the client should bring a gun he/she can shoot accurately and as quickly as possible while being accurate. However, on a hunt I'd rather take responsibility for my shots and not depend on the PH to close the deal. So, if that means I take a big bore, then so be it. Heck, I have a bear hunt in 6 days before I go to Africa in a month, I like shooting the bigger guns so will be using 335gr tipped CEB Raptor at 2800 ft/s on my .500.