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The rings only help on the down stroke . There is to much of a load on the die/threads when sizing a case for any little O-ring to make a difference. I learned this long ago with my Hornady bushing system. The nature of the design makes all dies in it free floating on a O-ring because thats how the bushing sits and stay’s in place in the press . The O-ring forces the bushing to make firm contact with the press as if there is already a slight load being exerted. This results in zero movement in the bushing on the upstroke . However on the down stroke the bushing and die can be seen moving quite a bit . It has very little to no effect on concentricity unless it can help center the expander button as its pull through the neck .
I have a concentricity gauge and I’ve seen zero positive effect knowing my dies are semi free floating .
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If Jesus had a gun , he'd probably still be alive !
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