Keeping your scope perfectly aligned is critical to long-range accuracy and the Wheeler Anti-Cant Indicator is a pivotal tool for ensuring your rifles accuracy. Canting your scope even just a couple of degrees can cause error in point of impact. With modern Drop-Compensating scopes an Anti-Cant Indicator is a necessity. If your gun isn't aligned correctly dialing up the turrets or using hold-over marks will just throw your shot off. This error can easily be enough to cause misses. The Wheeler Anti-Cant Indicator ensures that your rifle is always held near perfectly vertical eliminating any chance for Cant Error to cause a miss.