In the mid 1980s it became apparent to bench rest shooters that something was missing in the accuracy department.  It would take 8 to 10 rounds to get on paper at 1000 yards, and varmint hunters were missing shots over 300 yards that should have been made.  The solution to this dilemma came in the form of the Anti-Cant Device, or ACD.  The improvement in accuracy was so profound that it is rare nowadays to find a serious shooter that doesn’t use one and that doesn’t recognize its value to improved accuracy.  The ACD was the first such device on the market.

A .308 bullet at 2750 fps with the target at 500 yards, and the rifle canted 6 degrees (the distance from 12:00 to 12:01 on your watch face, the bullet will strike 8 inches low, and 3 inches to the side of the cant. 

Tens of thousands of ACDs have been sold since it first came on the market in 1986, a fact which speaks for itself. It is tough, unobtrusive, and easy to set up and use.