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I think any decent bullet in .270 win should take down a deer no problem especially with a "stout" load of powder. I think an 83 grain moving at 3800fps+ will kill just as well as a 130gr @ 3100fps or a 150 at 2880fps.
Im assuming the main difference would be trajectory (faster lighter=flatter obviously) and meat damage, the faster bullets probably destroy more meat.
An 83 grain will still have over 850ft/lbs of energy with the bullet traveling over 2100fps @ 500 yrds. The heavier bullets will tend to have more energy at that range because they carry more mass to the target and generally have better BC's.
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