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The Sinclair Bullet Seating Depth Tool has long been popular among handloaders who want to maximize accuracy in their rifles. Our most recent version is made from polished and ground stainless steel, measuring one fourth inch in diameter with an end specifically made for use with 17 and 20 caliber rifles. The other end of the tool is for use with 22 caliber rifles and larger. This tool helps determine the distance a loaded round contacts the rifling for optimal accuracy.

The Sinclair Seating Depth Tool works well with most bolt action, single shot, and AR-type rifles. It comes with a Delrin action guide that fits most bolt-action rifles, including Remingtons, Savages, Winchesters, and many Rugers (with a 0.690" diameter). To get the most precise measurement, use fireformed brass and bullets, which will produce accurate measurements time after time.

We also offer guides for AR-15's, AR-10's, and Tubb's 2000's. The guide differs a bit from our standard bolt-action guides. This guide fits into the back of the upper receiver (with the bolt removed), allowing the tool to be used as normal.

To achieve the best results, use this tool with our Bullet Comparators and a precise set of calipers to ensure repeated, exact Base-To-Ogive measurements.