Des Moines, Iowa – (Ammoland.com)- Now that spring is upon us – really, it is! – shooters in the less temperate regions of the U.S. are dusting off their range bags, digging out the shootin’ irons, and heading out to the nearest range to brush up their skills. If you’re looking to improve your shooting, or just keep an accurate record of your and your guns’ performance, you need to know how to measure shot groups. The easiest and most commonly used method of measuring shot groups is the “center-to-center” method . . .