Per Chuck Hawks... 2000 fps
The minimum recommended impact velocity is 2000 fps to initiate expansion and maximum recommended impact velocity is 3400 fps. Judging by photos in the Hornady catalog, 2700 fps produces good expansion.
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I shot a 200+ whitetail with a 30-06 using the 165 grain interbond. The shot was 177 yards and the deer went down immediately. I really think it's too much for a whitetail and would be a perfect elk round but it will work on either with no issues.
