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If you've been chasing consistent accuracy and still measuring your handloads off the bullet tip, the Sinclair Hex Style Bullet Comparator #1 is the tool that changes how you reload. Measuring to the tip gives you overall length, but bullet tips vary from one to the next. This comparator lets you measure to the ogive instead, which is the part of the bullet that actually contacts the rifling, giving you the repeatable numbers that tight groups are built on.
Sinclair has been turning out these hex comparators for over two decades, and the design is refreshingly simple. Each hole on the stainless steel hex is cut with a throating reamer, so it mimics the real throat geometry of a rifle rather than just a plain drilled bore. You set the comparator against your caliper jaws with a loaded round or seated bullet, take your reading, and you've got a base-to-ogive measurement you can record and repeat for every future batch of that bullet in that rifle.
This #1 model handles six of the most common rifle diameters on one tool: 22 caliber (.224), 6mm (.243), 25 caliber (.257), 6.5mm (.264), 7mm (.284), and 30 caliber (.308). That range covers a huge slice of popular hunting and precision cartridges, from .223 Rem and 6.5 Creedmoor to .308 Win and plenty in between.
One nice touch is that the comparator doesn't clamp onto your calipers, so your calipers stay free for case trimming, neck measurements, and everything else on the bench. It's a grab-it-when-you-need-it tool. Machined from stainless steel, it holds up to years of handling without rusting or wearing out its reference holes. For anyone serious about seating depth and load consistency, it's one of those small tools that earns its spot in the loading kit fast.
You place the hex comparator over the tip of a loaded round or seated bullet and measure against your caliper jaws. The holes are cut with throating reamers to mimic a rifle throat, so the tool contacts the bullet at the ogive rather than the tip. That gives you a consistent base-to-ogive measurement you can record and repeat for future loads.
The #1 model has six throated holes for 22 caliber (.224), 6mm (.243), 25 caliber (.257), 6.5mm (.264), 7mm (.284), and 30 caliber (.308). It covers a wide range of common rifle cartridges on a single tool. If you shoot .17, .20, .270, or .338, the #2 model handles those diameters instead.
Yes, the comparator is designed to be used together with a set of calipers. It does not attach to your calipers, which means they stay free for other measuring tasks on the bench. A good set of dial or digital calipers will give you the most accurate and repeatable readings.
Bullet tips can vary slightly from one bullet to the next, so measuring overall length to the tip introduces inconsistency. The ogive is the point that contacts the rifling, so measuring there gives you a far more reliable reference for seating depth. This is why precision reloaders rely on a comparator to fine-tune their loads for a specific rifle.
| UPC | 050806111554 |
|---|---|
| Manufacturer | |
| Caliber/Gauge | .25 Caliber |
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