Why does the length of the 2 3/4 and 3 inch loaded slug measure less than the exact length?
The existence of a crimp on the hull of an unfired slug is essential, and regulates the cartridge’s initial overall length. While a crimped slug is someone shorter than a shotgun’s chamber length, once it is fired, the crimped area straightens out to its original length, matching the designated chamber length. This is standard within the industry.
