Primer Pocket Gauge
At one time or another, most handloaders have seated a primer in a loose fitting primer pocket; and of course,
it wasn't discovered until AFTER the primer was seated. This handy little tool is designed to help the handloader
verify that primer pockets have not expanded too much from previous firings. Firing handloads with a loose primer can burn the
face of your bolt, and it can have a negative affect on accuracy.
I recommend using this tool to check the primer pockets in every case BEFORE seating primers. This ensures your primers will always fit properly. You will need one of these tools for checking LR & LP primer pockets, and another similar tool for measuring SR & SP primer pockets.
Check the size of primer pockets first.
Rifle and pistol primers only come in two
different diameters . . . SMALL and LARGE. Small Rifle (SR)
and Small Pistol (SP) primers both measure .175" While
Large Rifle (LR) and Large Pistol (LP) primers both measure .210"
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