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You know what it's like when you tilt your crosshairs out of vertical—you can't hit a thing at long range. The reason is that your scope reticle is sighted in straight up and down to zero a bullet that travels in a straight up and down trajectory arch. If you tilt your gun to either side, the trajectory arch will no longer be aligned to your scope reticle. Not to worry, however. A scope level can keep your crosshairs in line.
A scope level attaches to standard 1-inch scope tubes and folds down out of the way when you're not using it. When you flip it up, you can actually see the bubble in the level when you're lining up your shot in the scope eyepiece. You'll never have to wonder about being out of vertical again.
You don't, really, unless you want to hit more of what you aim at. Target knobs let you change your scope zero to match wind and distance conditions and quickly go back to original settings... you just use the markings on the target knobs.
Target knobs are easy to install. They just replace your dust covers. The inside connections are specifically designed to fit either Leupold, Burris, or Tasco scopes.
OK, it stands to reason that if your scope reticle doesn't stay at the same point of adjustment, it will not give you the same point of aim from one shot to the next.
Scopes adjust the reticle (eyepiece) by means of screws which push the reticle tube against a leaf spring. From one shot to the next, recoil may shift the reticle tube against the spring. This is no problem as long as it returns to the same position. The scope will keep the same point of aim. But if it moves, your scope will not shoot accurately. It's that simple. The reticle tube on a quality scope will move little or not at all upon recoil and your adjustments will stay consistent.
*You should be aware that the point of impact can change on a variable scope as you zoom the magnification.