Small pistol and rifle primers utilize a cup 0.175" in diameter, while large pistol and rifle primers measure 0.210" across. Large rifle primers are 0.008" thicker than a large pistol primer.

So, broadly speaking, there are four types of primers: large rifle, large pistol, small rifle, and small pistol. As mentioned, 9mm handgun cartridges use small pistol primers. Small primers have a ...