https://www.ebay.com/itm/1337878279...=&widget_ver=artemis&media=EMAILI use the tool above for the plunk test.
Also the gray box RCBS dies expander plug looks the same as a Lyman m die expander.
I tried almost everything the prevent the shaving of lead while seating the bullet. My newest die is the Redding expander which is coated. Seems to be working fine. Hasbeen