HORNADY TOOL 0814087 RF17 Hor Lnl Rim Thick Gauge 17-22

If you REALLY want to improve your accuracy with your .22, combine this with your digital caliper or buy this in combination with your Lyman Electronic Digital Caliper. You can effectively turn ho-hum ammo into MUCH better match-grade groups. Attach the 3 aluminium parts to your caliper, then start knocking out your match ammo. AND, it also works on .17 ! Inexpensive, easy to use and VERY effective.