Whatever you use, put one of these labels on it. .002" die height change per mark. Makes die adjustments for shoulder bump easy and precise.
View attachment 1084934
Bart B.
In the photo you posted I can see that slip joint pliers were used to grab the lock ring and chew up its surface.
(Go Navy)

You need the pliers below we were issued in the Air Force. That way your lock rings will not look like a herd of beavers were chewing on them.

Crescent 52910N A-N Connector Pliers, 10-Inch (with "soft" rubber jaws)
https://www.amazon.com/dp/B00170RES8/?tag=accuratescom-20

The above message was brought to you by the "Society for the prevention of cruelty to lock rings"
