Using Elevation Data With Target Knobs

Spec Ops Shooting

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Elevation Settings, .308 168-gr. BTHP Match

Yards MOA Settings* Inches +/-

100 zero zero

* Assumes 1/4 MOA per click.

Here's a handy way for a police sniper—or any long-range rifleman —using target knobs to record and refine his elevation knob settings. First, draw up a 3 x 5 card with increments of 25 yards, from your minimum to maximum engagement distances, depicted here as 50 yards out to 300 yards. Then, using your round's data, enter the "book" trajectory and elevation knob settings. Since you're using a 100-yard zero, at 200 yards a .308 168-grain BTHP would impact 4.4 inches low (-4.4"), thus requiring a knob setting of UP 2 MOA plus 1 click. Enter the 300-yard data, too. Now, with a solid zero on your scope, carefully test-fire it at each 25-yard increment, using a laser rangefinder to confirm these distances. Learn exactly what the knob setting should be at each distance and enter it on your card. You'll find that the book settings will be a little off because of tiny differences in your rifle/scope/ammo and the book assumptions. It's especially important to test-fire at less than 100 yards (recall, the average police engagement is about 70 yards) because "funny" things happen during that short-range trajectory. At 75 yards (firing with that 100-yard zero) you may well find your round impacting a bit high, perhaps one click. That's because your bullet path rises slightly above your line of sight. And at 50 yards (firing with the knobs set on the 100-yard zero) you'll probably impact about an inch low because your scope reticle is 1 1/2 inches above your bore. Don't worry about the technical explanation-just test-fire at 50 and 75 yards and then adjust your knobs and record these settings so you know exactly the correct elevation. Duplicate this card, cover it with plastic tape, and keep it in your rifle case. Every time you case your rifle, make a habit of returning the knob to its zero on the correct rotation, and recheck the zero every time you uncase it. Think of it—just fill out this card and you'll be dead-on for firing each 25 yards all the way to 300 yards. Though our sample implies a maximum range of 300 yards, I recommend that a police sniper eventually refine his elevation settings all the way to 500 yards, just in case.

Using a Sniperscopu

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