Who here doesn’t shoot beyond 300yrds ?

[Plague]

This right here with a proviso:

smacking anywhere on steel at 600+ is not the same as being capable of ethically killing an animal at 600+. Which means "confidence" could be unfounded.

EC's Ethical Hunter challenge proves how few are capable of this. I will, however, concede that a deer's vital area is larger than 1moa @500. But it does highlight the massive gap between a 1MOA rifle at 100 and a 1MOA rifle/shooter at 500+.

Go through every one of those videos and add up how many of those misses were still well within the vitals. Of those that hit outside of true vital area, do you think most of them would have done much better at 300 yards? Likely not. How many of the folks missing the vitals also have issue with operating the rifle smoothly? Most of them.