A 9mm bullet typically uses a small pistol primer. However, since these primers are usually always out of stock some gun enthusiasts experiment with using magnum pistol primers. One user says that using magnums is a waste of time; the difference between magnum and small pistol primers is too small to matter.

Are small pistol primers interchangeable?

Small rifle and small pistol primers are interchangeable. Small rifle primers will add several FPS to your velocity thus a tad to your power factor.

What is the difference between large and small pistol primers?

Numerous gun owners and shooting experts have compared both types of ammunition and found no discernible difference. On average, a round outfitted with a small primer has the same power, range, and accuracy as one designed for a large primer.