Kentucky Windage - An estimate of the modified point of aim required to compensate for wind or for target movement. Synonymous with hold-off.
Keyhole - Elongated hole made in a target by a bullet that is tumbling in flight, hence strikes the target other than point first. Caused by inadequate rotational stabilization of the bullet (usually due to insufficient barrel twist; the twist is "too slow"), deflection of the bullet by objects in the bullet's path, or other factors.
Killing Power - Vague term applied to a cartridges ability to kill an animal quickly with a single shot, assuming adequate bullet placement. Often wrongly equated with bullet energy. Killing power cannot be measured in precise terms, as neither it nor bullet energy take into account factors such as penetration, bullet performance, etc.
Kinetic Energy - See Energy (of motion).
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