Quick Answer
To quickly zero a rifled shotgun with slugs, use a shooting chronograph to determine the muzzle velocity, then adjust the sight for 200 yards with a 100-yard zero at the 12 o'clock position and a 20-inch height adjustment for every 1,000 feet per second of muzzle velocity.
Choosing the Right Sight
When zeroing a rifled shotgun with slugs, it’s essential to select a sight that’s designed for this specific application. Look for a sight with a large, elevation-adjustable post and a windage-adjustable base. Consider using a high-quality, adjustable bead sight or a ghost ring sight, as these provide the necessary precision and adjustability. Some popular options include the Williams Fiber Optic Sight or the Troy Industries Folding Sight.
Setting Up for Zero
To start the zeroing process, set the sight to a 100-yard zero at the 12 o’clock position, then adjust the height for the muzzle velocity. A general rule of thumb is to add 20 inches of height adjustment for every 1,000 feet per second of muzzle velocity. For example, if the muzzle velocity is 1,400 feet per second, you would add 28 inches of height adjustment. Use a shooting chronograph to determine the muzzle velocity, then make the necessary adjustments to the sight.
Refining the Zero
Once you’ve made the initial adjustments, fire a few shots to gauge the point of impact. Use a spotting scope or a rangefinder to determine the point of impact, then make fine adjustments to the sight as needed. It’s essential to fire multiple shots and verify the point of impact before making any adjustments, as the rifled barrel can be sensitive to temperature changes and other environmental factors. Continue refining the zero until you achieve a consistent point of impact at 100 yards, then adjust the sight for 200 yards as needed.
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