OAL Question on 223
Yesterday I went to the local Cabela's and purchased the Hornady OAL Gauge. This is the tool that allows you to insert the test case into the breach, and by using a flexible cable, move the bullet up next to the rifling in the chamber. In other articles I have read, this is the best place to set your OAL.
Now first, I have a new Colt LE6920 AR15, so the amount of wear is not an issue. After following the instructions of inserting the gauge into the gun, the measurements I got were eye opening: The measured OAL was 2.38 inches, and at that length the 55 grain FMJ-BT bullet was just inside the case!! I have tried it many times and get the same results.
So, has anyone else used this tool, and what were the results?