If your shell holder doesn't securely grip the sell and firmly fit into the press during reloading, you're bound to have headspace and sizing problems. RCBS manufactures their shell holders to the industry's tightest tolerances, using only the finest steel.
Fits:
.338 Marlin Express
.500 Smith & Wesson
Fits:
.338 Marlin Express
.500 Smith & Wesson
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