Beside weighing ammunition (to sort out potential powder loads and/or bullet lead weight deviations), the measuring of the rim thickness follows the rational that a thicker - or thinner - rim will cause the bullet to sit at a slightly different position at the start of the rifling and thereby impact on internal and external ballistics.
Hornady, well known as a leading ammunition manufacturer, offers a gauge kit, to fit any standard 6 inch caliper (not included), that will enable the user to measure the rim thickness of common rimfire ammunition – with two bushings included on the package: one for 22 LR and another for 22 Magnum and 17 HMR.
Set-up takes just a couple of minutes, clamping the gauge elements (a body, one of two rim thickness bushings and an anvil) on the caliper (using the included set of brass finger-screws). After testing for alignment and proper ‘hands on’ grip of all parts, measuring the rim thickness is made by simply inserting one round of ammunition at a time on the opening of the body, and closing the gauge, so that only the rim gets to be measured against the anvil section. Make sure to double check the ‘zero’ of your caliper frequently and to remove any excess lubricant (present on rimfire ammunition) from the contact surfaces.
The Hornady Lock-N-Load Rimfire Thickness Gauge, part number RF17, is priced around £20 GBP and can be found on many online retailers and specialized shops.
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Hornady Rimfire Thickness Gauge Extreme ammunition sorting for precision shooting by Pedro Mateus.
Hornady thickness gauge kit along with a standard 6 inch digital caliper
A 22 LR round is inserted Round full inserted and rim thickness measured with the caliper
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