The tools and knowledge available to a Squad Designated Marksman enable him to quickly place accurate fire against a target in the intended range. However, tolerances in calculations, time constraints, environmental factors and incoming fire - all work against the marksman, meaning that first shots do miss. A competent marksmen will quickly adjust their fire to hit the intended target.
Adjustment of fire - Visually estimating offset
If you have a non-milliradian sight, the only method of adjustment available is to:
- Observe the existing impact point - Easier with tracer rounds, look for evidence of impact on the ground or on an object behind the target.
- Estimate the offset from the aim point (when your reticule crosshairs were pointing) - e.g. in the example below, the impag point was approximately two body widths to the left, and half a body higher.
- Adjust your fire by aiming the reticule by an equal amount in the opposite axes - e.g. in the same example, aim two body widths to the right, and half a body lower
This method is quick, often accurate enough and can be used with any weapon/scope.
Adjustment of fire - Measuring offset in mrads
If you have a milliradian scope, as most modern-era marksmen will do, you can more accurately calculate the adjustment using the mildots on your scope.
- Observe the existing impact point.
- Measure the offset in mrads - in the example below, the impact point is 2.5 mrads left and 1 mrad up from the centre of the reticule.
- Adjust your fire…
- By aiming the reticule by an equal amount in the opposite axes - e.g. in the same example, aim 2.5 mrads to the right, and 1 mrad lower, or…
- By dialling in the necessary adjustment - e.g. dial 2.5 mrads to the right, and 1 mrad lower
Visual adjustment vs Scope adjustment
Visual adjustment is quicker but potentially less accurate - even if you know exactly what the adjustment should be, making a visual adjustment is less reliable than putting the centre of the reticule on the target. Dialling in the adjustment into the scope, takes a little extra time, but then you just need to centre the reticule on the target.
If you have multiple targets in a similar area, it may be worth the investment to adjust your scope, or at least the lateral adjustment - wind and other lateral effects are likely to be similar when aiming in a given general direction. However if your targets are spread widely apart, the adjustment will be different for each shot, thus visual adjustments might be preferred.
Above: Scope view showing the impact point offset from the reticule