A few of you have missed the advise I gave.
I got this from a RCBS technician - Turn the die 1/4 turn past touching the shell holder. That will bring the base into spec. After that size like you normally would. After the first sizing to get the base the correct diameter I set the full length sizing die to almost touch the neck. This has worked in my AR-10 and my 308 bolt guns and my Browning BLR 358 (using 308 military brass).
This "1/4 turn past touching the shell holder to get the base right" advise came from RCBS. It worked for me and that's my recommendation.
Last edited by Bugger; 06/12/21.
