These products are continuously tested and improved. As a result these are more sensitive, easier to seat and more compatible with progressive and automated loading equipment than ever before. They utilize modern non-corrosive and non-mercuric initiator mixes for the cleanest burn possible. These are the “bread-and-butter” of reloading, the most commonly called-for primers in reloading recipes.Standard primers are remarkably clean-burning, leaving primer pockets cleaner and extending the time between pocket cleaning. That’s a huge benefit for progressive reloaders. They are more sensitive and easier to seat than older, and engineered for smooth feeding in automated equipment. Available in 1000 or 5000 count boxes.