I have a RCBS sizing die that the o-ring near the top that seals against the seating nut has swelled. Does anyone happen to know what size this o-ring is and if it made from any special material? I think it has swelled enough that I won't get an accurate reading with a mic. It's large enough that it I try to force the nut on, I may cut the ring.
Last edited by ubetcha; 11-23-2020 at 10:48 AM.
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