"....I have seen several gut shot elk hit with a 243 that just laid down and died on the spot..."
Really?
If your words are in ernest, then youhave immensely moreexperience withgut shot elk than I do.
(1) How in the heck did that happen? and,
(2) How did you continue to let yourself beinvolved withit?
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I think it is likely that most of us,if health forced us to go from being a righty to a lefty (or vice versa), would not be able to handle as much as we used to. If I only had one eye, then I'd also probably seek out modest recoil.
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Essentially is no difference (very slight) between 7x57 and 7-08 would be the reason --- other than the 90 or soyears --- "big" improvementgiven all that time to come up with a better mouse trap.