The best die lock rings that will never ever come loose?

Hornady make a good lock ring. It will stay put if secured properly.
I use the Hornady lock rings on all my RCBS , Lee and Redding dies. They stay put and are easy to adjust.
 
All of my die sets were Lyman until I bottomed one out with the wrong shell holder. Couldn't get another Lyman at the time for my .375. Went with RCBS and could not get it to tighten without a lead shot under the brass set screw on the third try. Very frustrating. I didn't know that this was a problem because I had never encountered it with the Lyman sets.
 
+ "however many" on the Hornady. New dies get these before use regardless of what is on them.

Hard to get too excited about die rings but when someone asks, these just work, 110%. IMO, the wrench flats on the Hornady rings knock other/similar rings without, out of contention. I am more than happy with these that I won't change to another.
 

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