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"......not really an elk cartridge"...?? Your elk must be a lot tougher than ours.
Maybe we don't know how to cook 'em properly.
Seriously, I've had 2 people locally report failures on elk with the .375 Win. One was himself the shooter, the other was a friend of the shooter, but the shooter was someone I know by reputation. In both instances the report is of shots apparently going where they shooter intended to hit the elk. I have no first hand reports of people known to me, or even second hand reports by people known to me, of success.
That doesn't mean I wouldn't shoot an elk with the .375 Win but 'til I have a string of successes to reflect on, I might be a little more cautious about shooting elk with the .375 than I would deer with a .30-30.
Since you seem to take exception to my statement, let me ask you, how many elk have you personally killed with the .375 Win?
Tom