Sinclair International Comparator & Bump Gauge Body Kit, Xl

The Sinclair International Comparator & Bump Gauge Body Kit in XL size is a precision reloading tool designed for shooters and handloaders who need to sort bullets by base-to-tip length with confidence. This comparator body accepts Sinclair's stainless steel inserts—each caliber-specific and machined with a taper and short straight section—to accurately measure the bullet's bearing surface. Unlike standard drilled-hole comparators that allow lateral play, the tapered insert design eliminates wobble and gives you repeatable measurements every time you mate it to your digital or dial caliper blade.

Sinclair comparator inserts cover calibers from .17 through .45, and the same inserts work in both Sinclair and older Stoney Point comparator bodies, making this kit a flexible upgrade or starter solution for any reloading bench. Whether you're segregating bullets before meplat trimming or chasing tighter tolerances for precision rifle loads, the comparator body and inserts let you quickly sort large batches without the fatigue of manual calipers alone. This is particularly valuable during high-volume sorting when a digital caliper's speed and consistency shine.

Note: This tool is designed for bullets measured in their standard length and bearing surface position. For measuring seated rounds at magazine length or shorter, Sinclair offers alternative comparator models (#09-600 and #09-700). The XL body kit provides the platform; caliber-specific inserts are selected separately to match your cartridge needs.

Key Features

• Tapered and straight-section insert design eliminates comparator wobble for consistent bore-to-tip measurements
• Stainless steel inserts cover .17 to .45 caliber range
• Compatible with both Sinclair and older Stoney Point comparator bodies
• Attaches to blade of your caliper for fast bullet sorting during reloading prep
• Ideal for high-volume bullet segregation before meplat trimming or precision load development

Frequently Asked Questions

What caliber inserts does the Sinclair comparator accept?

Sinclair offers caliber-specific inserts ranging from .17 through .45. You select the insert that matches your cartridge; the XL body kit provides the comparator body itself.

Can I use Sinclair inserts in an older Stoney Point comparator body?

Yes. Sinclair comparator inserts are designed to work in both Sinclair and older Stoney Point comparator bodies, offering compatibility and flexibility across platforms.

Is this comparator suitable for measuring bullets loaded to magazine length?

No. This comparator is designed for measuring bullets in standard bearing surface position. For measuring seated rounds at magazine length or shorter, Sinclair offers alternative models (#09-600 and #09-700) designed for that application.

How does the tapered insert design improve accuracy?

The tapered and short straight-section insert design duplicates the chamber throat shape more accurately than standard drilled-hole comparators, which eliminates lateral play and wobble for repeatable, consistent measurements.