Quick Answer
To find the right scope height for .338 Lapua, use a scope adjustment tool and adjust the scope's elevation knob to ensure the reticle is centered between 2.5 and 3 MOA above the rifle's boreline at 100 yards.
Determining the Optimal Scope Height
To determine the optimal scope height for a .338 Lapua rifle, you must consider the bullet’s trajectory and the scope’s parallax error. A typical .338 Lapua bullet drops 2.5-3 MOA at 100 yards, so the scope’s reticle should be positioned 2.5-3 MOA above the boreline at this range. A scope adjustment tool can help you achieve this.
Using a Scope Adjustment Tool
A scope adjustment tool is a handy device that allows you to adjust the scope’s elevation knob without looking through the scope. This is particularly useful when adjusting the scope’s height for a specific rifle and cartridge. With the tool, you can adjust the elevation knob in small increments, usually 0.1-0.5 MOA, until the reticle is centered between 2.5 and 3 MOA above the boreline at 100 yards.
Accounting for Bullet Drop and Wind Deflection
When shooting at longer ranges, bullet drop and wind deflection become more significant factors. A .338 Lapua bullet drops around 25-30 MOA per mile, so it’s essential to adjust the scope’s elevation accordingly. Additionally, wind deflection can be significant, with a 10 mph wind causing a 15-20 MOA shift at 1000 yards. By adjusting the scope’s height and using a ballistic calculator, you can compensate for these factors and ensure accurate shots at extended ranges.
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