February 23, 2023 Ryan Cleckner explains in a helpful NSSF Video why you should not cant your rifle. He explains why it is best to rotate it counter-clockwise or clockwise. Cleckner explains how canting the rifle in a particular direction will alter the point of impact. “When you rotate your rifle, not only does it move in the direction you rotate it, but it also loses some elevation as it rolls down.” Cleckner explains that this can cause you to miss on one side or another.
Cant to the Right — Your shot will be missed low and right. Cleckner demonstrates the effects of rifle canting on a 600-yard target. The shot POI is moved completely off the steel silhouette target by a few degrees of canting (either to one side or the other). The POI change is caused by the fact that you lower (and laterally shift) the scope sight-line relative the bore axis. This effectively changes your zero. David Tubb explained that every 1 degree you are off when shooting with a sling, is approximately six inches of difference laterally at 1,000 yards.
Cleckner assumes that the scope/sights are placed at the center of the rifle with the rifle level and plumb. This works in most cases when shooting prone from a bipod, front mechanical stop, or front sandbag. Many sling shooters like John Whidden and David Tubb tilt their rifles inward to make it easier to hold the sling or align their eyes better. It is possible to hold the rifle at an angle, but it must be consistent for every shot. It is not a sin to cant the rifle. After you have confirmed your zero on the target, the cant must be the exact same for every shot. Or you will experience shot POI movement Cleckner describes. Consistency is key.
John Whidden is a 5-time National Long Range Champion and he holds a Palma rifle. John now shoots a match rifle using an Anschutz stock. He holds it more upright but still has a counter-clockwise cant. John also placed his iron sights at an angle to ensure that the adjustments (and plumb) are correct and accurate even with his canted hold. “While it may not be apparent in the photo, the sights on mine are set up so they’re straight vertically and horizontal while I hold my rifle canted. It is crucial that your adjustments (scope and sights) are horizontally and vertically correct. “Inexpensive Dual-Diameter Scope-Mounted Bubble Level
A bubble level attached to the scope or rail is the best way to prevent inconsistent rifle canting. The Jialitte Scope bubble level is a versatile and affordable product. The inside diameter of the Jialitte Scope Bubble Level is 30mm. It also has an inner insert ring that will fit into 1?-diameter main tubes. The Jialitte unit has a nice radius and a low profile in its middle. The user reviews have been extremely positive. A 30mm scope could cost you $35.00 or more. Amazon sells this scope for $10.99
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