Adirondack: cartridges cases can vary considerably from manufacturer to manufacturer. The composition of the metal frequently will differ, the overall length often varies even in new cases from the same manufacturer, and certainly the internal capacity will often be different. Because of these variations you should never mix the case brands, minor differences like these can translate into variations in pressure and how the load performs. Once one brand of brass has been fired form to that rifle's chamber, after that neck sizing will aid in preventing the cases from stretching.
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