If your shell holders don't securely grip the shell and firmly fit into the press during reloading, you're bound to have headspace and sizing problems. RCBS shell holders are manufactured to the industry's tightest tolerances, using only the finest steel. Clip spring holds Shell Holder in place, yet allows rotation to any convenient angle. Fits most popular presses.
This shell holder works for the Winchester .405 case, some other brands don't. Do yourself a favor and buy this one and forget about cases fitting too snugly.
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