Hundreds of years practice I'd bet he can do it by feel. Most military snipers can and they don't have nearly the span of time to practice as he had. Heck, lee harvey oswald made three shots and had two on target(within a span of seconds) from a block away with one of the most inaccurate rifles available (the bullets were famous for tumbling I'm air) and the previous record before the above one was a little over a mile iirc.
*No scope either, he used the iron sights iirc
Aiming center mass and plenty of people will argue with you about who shot who from where, they've been doing so for over 50 years now.
@Mira
Never said Kincaid couldn't hit him, Kincaid would never have attempted to place a head shot. Maybe place high center mass but never head. Glad you Googled longest sniper kill, his first shot hit the ground and none of the soldiers noticed so didn't react. Both shots were aimed center mass.
If Ivy knew ahead of time then why didn't she just require Kincaid to guard her somewhere else? Pretty sure he can't be in two places at once but that will be argued. She chooses to have Harry mortally wounded and in Mab's hands while barely hanging on to life?