How to verify Scope’s true click values — Box Test

February 2, 2023 One MOA is 1.047. Inches at 100 yards means that you can calculate how far your point-of-impact (POI), will travel with four clicks. Unfortunately, you could be wrong. It’s not possible to rely solely on the manufacturer’s claims. Because of production tolerances, you need to test your scope to see how much movement it delivers with each click. It could move a quarter MOA, a quarter inch, or something else entirely. Scopes that advertise a 1/8-MOA click may deliver more or less than the actual MOA for 8 clicks. Lindy explains how you can check your clicks. “First, ensure that the rifle is unloaded. Use a 40? Use a 40? To make it easy to count the dots, I placed two dots each 5 inches. Place the ruler vertically (zero at the top) about 100 yards away. Measure carefully. Using max magnification and a hundred-yard zero, aim your center crosshairs at (zero end-point) the top of your ruler. An assistant should crank on 36 MOA (indicated). 144 clicks, being careful not to move it. You will need to have help, as it is very difficult to keep the rifle still if you turn the knobs by yourself. Each click will cause the reticle to move a little further down towards the ruler. When your helper is finished clicking, note where the center crosshairs are. If your scope is calibrated correctly, it should be at the 37.7 inch mark. To find out your click value, track where 144 clicks take you to the ruler. To get a repeatable, solid value, repeat this process several times. Now you know how much each click moves the reticle at 100 feet. This will also scale proportionally at longer distances. This optical method is more reliable than shooting because it doesn’t involve the uncertainty associated with determining a group centre. This means that 4 clicks moved POI 1.0177? rather than 1.047? (true MOA). This is a 5% error. I’ve tested many scopes and found that many have click values that are significantly lower than what the manufacturer claims. You cannot rely on printed specifications as each scope is unique. You can’t rely on printed specifications – each scope is unique. My Leupold 3.5-10M3LR was perfect. My U.S.O. was also on point. SN-3 with an reticle H25, but other SN-3s and my Leupold 6.5-20X50M1 have been off. My policy is to check ’em all. “From the Expert Very important and good article, especially from a balistics perspective. If a ballistics program predicts a 30 MOA drop at 1000 yards, and you dial 30MOA on your scope, hit high or low, it is easy to start questioning BCs, MSs and all other things under the sun. My experience shows that more than half of errors in trajectory prediction at long distance is due to scope adjustment error. This article contains important information that is essential for long-range shooting. — Bryan Litz, Applied Ballistics LLC. Bryan also uses the Tall Target Test to determine true Click Values. Click HERE to see a detailed explanation article on Litz’s Tall Target Test. It may not be republished in any way, in whole or in part, without prior written permission. Republishing is legal consent to paying licensing fees.
Similar Posts