That's a fact-- they are charming, and they do work just fine. I shot the one I had with 400-gr bullets, and they ran about 2300 fps. I'm quite sure that's very effective, though some are a touch faster. I just don't think that is needed.
Given that nature of our hunting, I think you ought to take whatever you want, within reason. .404 Jeffery, I'm quite certain, works just fine. .404 Ruger will work just fine too, I'm certain
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Dennis