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For all we now the "near miss" could have been way of and not near the brain. And also if the 577 was that good why did they make a 600 or a 700?

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For that matter, why have any new cartridges been introduced for the last 80 yrs?

The assertion that the 577 isn't up to snuff based on a missed brain shot is laughable!

I have seen people shot in the face with a .45ACP and a 30'06 point blank and both survived.
Does this mean the .45 and 30'06 are inadequate?