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:
7mm Remington Short Action Ultra Magnum
7mm Remington Ultra Magnum
.300 Remington Short Action Ultra Magnum
.300 Remington Ultra Magnum
.338 Remington Ultra Magnum
.375 Remington Ultra Magnum
.455 Webley
Fits:
7mm Remington Short Action Ultra Magnum
7mm Remington Ultra Magnum
.300 Remington Short Action Ultra Magnum
.300 Remington Ultra Magnum
.338 Remington Ultra Magnum
.375 Remington Ultra Magnum
.455 Webley
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