Sinclair Hex Style Bullet Comparator #2 (17-338 Caliber)

Description

Measuring overall cartridge length to the bullet tip is one of the quickest ways to get inconsistent numbers, since bullet tips vary from round to round. The Sinclair Hex Style Bullet Comparator #2 solves that by letting you measure from the ogive, the point where the bullet contacts the rifling, so your readings line up shot after shot. It's a small stainless block that works alongside your calipers, and it covers six popular diameters in one tool.

What the Hex Comparator #2 Measures

Model #2 has holes bored and throated for .17 (.172), .20 (.204), .22 (.224), .270 (.277), .30 (.308) and .338 caliber bullets. Each hole is cut with a throating reamer so it mimics the actual throat of a rifle chamber, which is what makes the comparator give you a real, repeatable contact point on the ogive rather than a rough estimate. Sinclair has been machining these for over two decades and the stainless steel construction holds up to constant handling on the bench.

Using the Sinclair Bullet Comparator at the Bench

The process is straightforward. Drop your loaded round or bullet into the correct caliber hole, close your calipers on it, and you've got your base-to-ogive measurement. Once you've found the seating depth your rifle likes, record that number and you can duplicate it exactly on every future batch using that bullet. It's also handy for dialing in seating depth changes on your bullet seater die without guessing.

Why Reloaders Keep One Handy

One thing worth noting is that this comparator does not clamp onto your calipers, so your calipers stay free for other measuring jobs around the bench. For anyone chasing tighter groups and working up precision loads, measuring to the ogive is the standard way to keep seating depth honest, and having six calibers covered in a single compact tool makes this a go-to for a lot of serious handloaders.