Re: 1450 yard whitetail last year...
Guess it all boils down to what the confidence level is for a given shot for an individual, and what percentage is acceptable. For a really nice whitetail I like greater than 80% with a 12" target area. I define my confidence level by the aggregate of all aspects. Wind, load, rest, mirage, etc. I have not yet seen this level at these ranges. I doesn't necessarily mean it doesn't exist, but I would be very skeptical at 1 mile.
"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt