Lyman Gauge for .243 Winchester.
To achieve the highest degree of safety and accuracy all bottleneck rifle cases be inspected after resizing. Ensure that the proper headspace dimension is maintained.
The best way to check this is with a Lyman case length/headspace gauge.
Simply inserts the case into the gauge to insure that it does not exceed the maximum or fall below the minimum allowable headspace. In addition, the gauge will identify a case which exceeds the maximum allowable case length .