I was aware of cold bore deflection, but never gave clean bore a thought. I sighted my hunting rifles cold because that is how there were going to be used. They weren't always clean bore, though. Hmmmm.
Wildly different situation. A successful hunting season for me would be two cold clean shots. One deer, one elk. Not that that is exactly how it worked out ever, but that would be the goal.
I don't believe I ever took a shot over 300 meters, probably closer to 200. I really wanted 100 or less.
Interesting stuff that I never even considered.