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I have one question...Will that (or another) fired brass out of that rifle still fit into your rifle chamber you are attempting to resize it? If it does so comfortably you may just want to neck size. Your rifle chamber my be a lot tighter than the SAAMI specifications. Therefore your RCBS die may be larger than you chamber.
You may want to buy you a Whidden Clickabled Adjustable Die or a Universable Clickable Nut ..and a Redding Match Shell holders.Your Shell Holder may be too Thick to shove you brass into the RCBS Die enough to bump the shoulder. Good Luck.