These are the bread-and-butter of reloading, the most commonly called-for primers in reloading recipes. CCI 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 CCI primers,
and engineered for smooth feeding in automated equipment.
For most handgun cartridges requiring a small pistol primer.