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This is the XL version of Sinclair's tool body, and the extra length is the whole point. Where the standard body is built around empty brass, the XL gives you enough room to check shoulder bump on a loaded round, which is handy when you want to confirm your sizing without pulling bullets. It clamps onto the blade of your dial or digital caliper and runs the same insert system Sinclair is known for, so one body covers a lot of ground once you add the caliber and shoulder inserts you need.
The design centers on precision inserts rather than a drilled-out hole. Sinclair's inserts are stainless steel and machined with a taper plus a short straight section that mimics the throat of a rifle chamber. That contact point sits close to the bullet's actual bearing surface, which cuts out the wobble and guesswork you get from cheaper comparators with plain drilled holes. The result is measurements you can trust to repeat load after load.
For bump gauging, the shoulder inserts index off the case shoulder instead of the exact datum line, giving you a clear, easy read on how far you're pushing the shoulder back during full-length sizing. It's a transfer measurement, so you zero off a fired case and chase consistency from there. Most handloaders aim for roughly .001 to .002 inches of bump on bolt guns and a touch more on gas guns like the AR-15. Dial it in once and your brass life and headspace consistency both benefit.
Comparator inserts run from 17 through 45 caliber, and they drop into both Sinclair and the older Stoney Point bodies. Keep in mind this listing is the tool body itself, so you'll pick up the specific caliber and shoulder-angle inserts separately to match your cartridges. One note worth passing along: these inserts aren't meant for rounds seated to magazine length or shorter, so plan your setup around that.
The XL body is longer than the standard version, and that extra length is what lets you measure shoulder bump on loaded rounds rather than just empty brass. Both bodies use the same stainless steel insert system. If you want to check seated ammo, the XL is the one to grab.
No, this listing is the tool body only. You'll add the caliber-specific comparator inserts and shoulder-angle bump inserts separately to match your cartridges. The body accepts inserts from 17 through 45 caliber.
Yes, Sinclair's comparator and bump gauge inserts drop right into this XL body. The inserts are also cross-compatible with the older Stoney Point comparator bodies. Keep in mind Sinclair and Hornady inserts are cut differently, so they won't give identical readings to each other.
The shoulder insert indexes off the case shoulder to show how far you're setting the shoulder back during full-length sizing. You zero off a fired case and measure your sized brass to track the change. Many handloaders target about .001 to .002 inches of bump for bolt actions and a bit more for AR-15 type rifles.
| UPC | 050806111332 |
|---|---|
| Manufacturer |
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