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Message: <blockquote data-quote="Duckhunter39480" data-source="post: 3685343" data-attributes="member: 48968"><p>I would attempt to fire some in an empty case just to see if these are still good..  I'm not suggesting you use them for actual loadings but I keep old primers (properly stored in empty primer boxes) and use them in reduced loadings for fireforming brass.  For forming things like 30-30AI, 357 AR, or converting 303 Brit into rimmed 35 Remington, I use these scrap primers, a moderate powder charge (from the Lyman Cast Bullet Loading Manual) and a cast bullet.  Not trying for accuracy or velocity, just trying to fireform a piece of brass.  A word of caution here!  Loose primers stored in bottles can detonate (explode vioently) if dropped and send primers in all directions (thimk Claymore mines) with possible seriously injury to anyone nearby.  If you do keep them, store them properly.</p></blockquote><p></p>