Hornady Lock-N-Load Rimfire .17-.22 Calibre Thickness Gauge
Sorting ammo by rim thickness will provide ammo with similar ignition qualities for improved accuracy.
This proven technique is used by competitive shooters and varmint hunters.
The Hornady rimfire gauge attaches to your caliper and includes bushings for use with most (not compatible with 17 WSM) .17 and .22 calibre rimfire ammo.
Note: Caliper not included and shown for illustrative purposes only.