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Message: <blockquote data-quote="Jack Shootza 50" data-source="post: 3694300" data-attributes="member: 49036"><p>Pistol primers are of lighter construction (the cup) and are shorter than rifle ones, a good example is the S&W 500, the first production of ammo saw pierced primers (too much pressure) so they re-tooled to produce the brass to use rifle primers and put out a warning not to try and use rifle in the older pistol brass, all new brass is for rifle primers. putting a rifle primer in an old case that used pistol ones might jam the gun up because of the shorter primer pocket or worse!</p></blockquote><p></p>