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Ballistics and Scopes
All scopes are built to different standards. Some come in 1/4 minute adjustments while others are 1/8 of a minute per click of elevation. If you want to figure out the maximum range you can shoot with your scope on your rifle with your ammo, here is a simple way for every shooter to figure it out - even if you only have a 100 yd range.
Before you start, you will need to figure out what kind of ammo you are going to shoot in your .308, .270, .300WM or whatever. You will need the ballistic chart for the ammo, which can be found on line or through the manufacturer. Typically the charts will show the drop in inches of a projectile at various ranges, assuming the rifle is fired with the bore level. Once you have the ballistic chart, go to the range and do the following:
1. Zero @ 100yds.
2. From 100yd zero, count remaining clicks to maximum elevation on the scope.
3. Multiply by MOA (Minutes of Angle) elevation measurement on the scope (1/2, 1/4, 1/8, etc.)
4. That gives you the remaining MOA on the scope to your maximum elevation (Ex 42.5Minutes).
5. Go to the Ballistic Chart and see what MOA is required for different distances, converting the inches if drop into MOA for each range (1 minute subtends approximately 1 inch per 100 yards). This gives you MOA needed (value M) to hit at each range (value R).
6. Compare (M) to (R). That is the farthest you can shoot back in distance with your system of rifle, scope, and ammo.
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