November 14th, 2009

Sinclair Bullet Sorting Assembly with Dial Caliper

Sinclair bullet ogive sorterSinclair International has a new tool assembly that lets you sort bullets by base to ogive length. The $79.95 Sinclair Bullet Sorting Stand with Dial Comparator (item 59-2000) comes with a heavy black granite base that stays put on your loading bench. The included dial indicator has a quick-release lever allowing easy placement and removal of bullets into the comparator. This lever allow the spring-loaded indicator shaft to pop up out of the way.

The special base comparators used with this tool (see photo), are sold separately for $10.99, and are offered in 22 caliber, 6mm, 6.5mm, 7mm, 30 caliber, and 338 caliber. The sorting stand can also be used with Sinclair multi-caliber hex comparators (item 09-700, $18.25).

Measuring Bullet Bearing Surface with Calipers and Comparators
While we like this Sinclair tool, the same function can be performed with a regular set of calipers, using two comparators with caliber inserts. If you use the Hornady (formerly Stoney Point) OAL system you probably already have a #B2000 comparator body and a caliber-specific insert ($3.99 at

Buy a second body ($14.39 at and second insert (of the same caliber) and mount one on each caliper jaw, opposite each other. Tuck the bullet’s boat-tail in one insert and the “pointy end” in the other, and you can quickly measure the bearing surface. It takes a few tries to get the right “feel” of how hard to close the caliper jaws. But if the comparator bodies are set up right, the process should be quite repeatable, and you can probably measure just as fast with calipers as with the Sinclair measuring stand. However, the Sinclair unit should be a bit more precise, if you’re trying to resolve bullet lengths to less than one-thousandth. If you want to measure base to ogive (rather than bearing surface length), just remove one comparator and measure with the heel of the bullet (end of boat-tail) touching one jaw, and the bullet’s “pointy end” in the remaining comparator.

Hornady comparator bodies