| Then, Equation 3. Number Of Scope Clicks To Be On Target Equation M.O.A. scope adjustment/ 1 click M.O.A. value = # clicks to be “on target” The 1 click M.O.A. value is listed by your scope manufacturer. Many scopes have a M.O.A listing of ¼ inch change in POI, per click at 100 yards. This 1 click M.O.A. value in this case would be ¼ or 0.25 M.O.A. On my Sightron SII Series 6.5-24X Mil-Dot Scope that sits on top of my 7 RUM , each click is 1/8 M.O.A. or 0.125 M.O.A. To find my M.O.A. scope adjustment, I’d simply do this: 23.83 inches of bullet wind drift / 5 M.O.A value at 500 yards = 4.8 M.O.A scope adjustment Then to find out the number of scope clicks to be on target I’d simply do this: 4.8 M.O.A scope adjustment / 0.125 M.O.A scope adjustment in 1 click = 18.4 clicks = 18 clicks Notice that we always round to the nearest whole number. There are no half clicks or quarter clicks to be made on rifle scopes. So now, I’m ready to make 18 clicks in the appropriate direction and that should put me on target. In this example, I merely calculated the elevation adjustment needed for a 168 grain bullet shot out of a 7 RUM at 500 yards. I’d also have to calculate the windage adjustment as well, using the exact same process, IF my rifle was NOT sighted in during 10 mph crosswinds at 500 yards, which it won’t be. It is far easier to calculate all these adjustments prior to going afield. After all, who can guarantee I’ll have the time to break out a calculator and do all these calculations while my trophy is walking out in front of me! Rather, I’ll simply do these calculations for the different ranges I’ll be encountering while afield and put them on my rifle. I’ll list the range, and the number of elevation clicks as well as the number of windage clicks I’ll need. A simple table stuck on the side of your rifle is probably the most popular with most long range enthusiasts. It may look something like this: Distance # Elevation Clicks # Windage Clicks (Full 10 mph cross wind) 100 yards 0 0 200 yards 0 0 300 yards 0 0 400 yards 18 14 500 yards 38 18 600 yards 60 23 700 yards 83 28 Since the total number of clicks needed can be quite high on my scope, I may consider re-vamping the number of clicks needed to the number of full turns needed. For example, say that in one full turn of my elevation or windage turret there are 30 clicks I may be able to simply say that at 500 yards I make one full revolution of the turret (30 clicks) plus 8 more clicks to make my elevation adjustment. My chart that I tape to my Remington Sendero might look like this instead: Distance # Elevation Clicks # Windage Clicks (Full 10 mph cross wind) 100 yards 0 0 200 yards 0 0 300 yards 0 0 400 yards 18 14 500 yards 1 Turn + 8 Clicks 18 600 yards 2 Turns 1 Turn – 7 Clicks 700 yards 3 Turns – 7 Clicks 1 Turn – 2 Clicks With the target turrets marked with various markings, I should be able to tell when I’ve made a full revolution of the turret, instead of trying to count out 83 clicks – a difficult task when watching the trophy of a lifetime walking across my shooting lane! Well, hopefully this will get me started shooting long range. It will still take lots of practice, patience, ability to “read” wind speed and direction and so on. However, with the advent of these tables, I should be able to get “on target” within a few shots and make corrections to my tables under ACTUAL shooting conditions before they’re needed! |
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