A movie scene I remember was a Clint Eastwood western. A bad guy is sniping from what looks like 1/2 a mile away. Good ole Clint fetches a case from his horse, removes a takedown bolt rifle, attaches a scope, looks through it, does a couple of adjustments to the scope and blows the guy off with one shot.

I learn something every day, and a lot of times it's that what I learned the day before was wrong