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If you've ever wondered why one load prints tight groups and the next one strings out, runout is often the hidden culprit. The Sinclair Concentricity Gauge gives you a clear picture of how straight your ammo really is by rolling the case or loaded round across two sets of ball bearings captured in anodized aluminum blocks. The dial indicator reads the movement, and you get an honest number on neck concentricity and bullet runout before that round ever hits the chamber.
The bearing blocks ride in a milled slot on the anodized base plate, which keeps everything aligned and gives the cartridge solid support as it spins. Those blocks adjust longitudinally, so you can set them up for anything from short varmint brass to long magnum rounds. Large thumb levers make those adjustments quick, and the heavy base plate stays put while you work. You can check sized cases at the neck, or measure loaded rounds either at the neck or out on the bullet near the ogive, which is where a lot of folks like to read seating runout.
The indicator tower adjusts both up and down and side to side, so you can position the tip exactly where you want it on the case. Finding two or three thousandths of runout is a common wake-up call, and once you spot it you can start chasing down the cause, whether it's your sizing die, a bushing, or your seating technique. Plenty of handloaders use this gauge to sort their straightest rounds into match ammo and set the rest aside for practice.
This is the dial indicator version, so the gauge comes ready to measure right out of the box. The mounting block fits standard 0.375 inch indicator shanks if you ever want to swap in a different gauge down the road. The ball-bearing supports have no moving parts to wear out, which is a big reason these tools tend to stay useful for decades. For the reloader who's serious about consistency, it's a straightforward, well-made piece of kit that does exactly what it promises.
You can check neck concentricity on sized cases and bullet runout on loaded rounds. The cartridge rolls across two ball-bearing supports while the dial indicator reads the deviation. You can position the tip at the neck or out on the bullet near the ogive, depending on what you're trying to diagnose.
Yes, this is the dial indicator model, so the analog gauge is included and ready to use. Sinclair also offers a base-only version for folks who already own a compatible indicator, but with this one you're set right out of the box.
It does. The bearing blocks adjust longitudinally along the base, letting it accept everything from small varmint cases up to rounds as large as .50 BMG. That wide range makes it a solid pick for reloaders who work across multiple calibers.
You can. The mounting block is built for dial indicators with a standard 0.375 inch shank, so if you want to run a different gauge down the road it'll fit. That flexibility is handy if you prefer a specific indicator or want a finer reading.
| UPC | 050806111585 |
|---|---|
| Manufacturer |
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