Hornady Lock-N-Load Rimfire Thickness Gauge 17-22 Cal RF17

Description

Anyone who shoots rimfire seriously knows that no two rounds out of the same box are truly identical. Rim thickness varies from cartridge to cartridge, and that variation changes how the firing pin crushes the priming compound, which affects ignition and ultimately where the bullet lands. The Hornady Lock-N-Load Rimfire Thickness Gauge gives you a repeatable, hands-on way to measure that rim and group rounds with matching characteristics together. It is the same sorting trick competitive shooters and varmint hunters have relied on for years to squeeze more consistency out of factory ammo.

How the Lock-N-Load Rimfire Gauge Works

The gauge clamps onto your own dial or digital caliper and uses a set of bushings to hold the case while you read the rim thickness. You measure a batch of rounds, write down the numbers, and separate them into groups that share the same reading. Once sorted, each group fires with similar ignition timing, and that uniformity shows up as tighter clusters on paper and cleaner hits in the field. It is simple to set up and quick to run through a box once you get a rhythm going.

Caliber Coverage of the Hornady Rim Thickness Gauge

The included bushings cover most .17 and .22 rimfire cartridges, including .17 Mach 2, .22 Short, .22 Long, and .22 Long Rifle. An additional bushing converts the gauge to read .17 HMR and .22 WMR, so one tool handles the bulk of popular rimfire chamberings. It is worth noting the gauge is not compatible with .17 WSM. A safety lanyard is also included, which is a smart touch since you are handling live rounds while you measure.

Keep in mind the gauge attaches to a caliper you supply, so the caliper itself is not part of the package. Made in the USA and backed by Hornady's lifetime warranty, this is a straightforward, durable addition to any rimfire shooter's bench or range bag.