Precision Throating Kit
The Precision Throater concept is designed to enable gunsmiths to perform precise, repeatable operations quickly with a simple hand tool. The tool features a removable pilot which guides a 6-flute HSS (high-speed steel) cutter. What sets the Precision Throater apart from ordinary reamers is its unique method of controlling depth of cut.
The straight portion of the cutter passes through a sliding bushing with a tapered shoulder at the front end. The bushing is precisely honed so that the cutter can rotate or move axially with ease, but lateral movement is virtually zero. Behind the bushing, the cutter shank is threaded with micrometer threads (40 TPI). A brass adjustment nut, backed by a knurled lock nut, controls precisely how far into the throat the cutter can reach. The adjustment nut features five equidistant grooves around its circumference each groove corresponds to .005″ of axial adjustment. Adjustments as small as .001″ can be made with confidence.
To set up the Precision Throater, gently insert the cutter into a “control” chamber (or a dummy chamber cut to the correct dimensions), turning in the “backward” (non-cutting) direction, until the cutter contacts the rifling lands in the barrel. Zero the adjustment nut against the sliding bushing for a rough adjustment, then tighten a little more (forcing the cutter slightly back out of the chamber) and lock the nuts.
Now cut a throat in a new chamber and measure the result. To increase the throat depth of cut, carefully back off the adjustment nut, lock in place, and cut again. Repeat this process until you achieve the required throat dimension. You now have a tool set up to cut the exact same throat dimension every time!
The Precision Throater can be used conventionally, in a lathe. It also is threaded for attachment on our Precision Throater T-Handle. With the T-Handle, you can perform throating operations in barrels while they are assembled to the action/stock.
Order seperately a threaded Shank adapter, which converts the Precision Throater to a 3/8″ (.375″) square drive. This drive is compatible with our Chamber Reamer T-Handle and common square-drive implements. This Premium Precision Throater Kit includes Precision Throater, T-Handle.
The standard shoulder angle for the Sliding Bushing is 30 degrees. In the chamber, this shoulder will contact HIGH on lesser shoulder angles (e.g. the .270 Winchester family of cartridges), and contact LOW on greater shoulder angles (e.g. 40-Degree Ackley Improved cartridges). Usually, this limited contact is adequate to control depth of cut while maintaining concentricity, but a little more care must be taken in the setup to avoid overcutting the chamber.
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Adapter for Precision Neck & Throat or Precision Throat Reamers$5.00
Threads onto the reamer to covert it to standard 7/16″ round shank with 3/8″ square drive flats.
22 Precision Throater$32.00
22 Center-fire throater allow for precise adjustments to the reamer so you can ream to any desired throat depth.
6mm Precision Throater$32.00
6mm throater allows for precise adjustments to the reamer so you can ream to any desired throat depth.
6.5mm Precision Throater$32.00
6.5mm throater allows for precise adjustments to the reamer so you can ream to any desired throat depth.
7mm Precision Throater$32.00
7mm throater allows for precise adjustments to the reamer so you can ream to any desired throat depth.
30 cal. (.308″) Precision Throater$32.00
.308″ Common American 30 caliber, throater allows for precise adjustments to the reamer so you can ream to any desired throat depth.
.338″ Precision Throater$32.00
.338″ throater allows for precise adjustments to the reamer so you can ream to any desired throat depth.
20 Caliber Precision Throater$32.00
20 Caliber throater allows for precise adjustments to the reamer so you can ream to any desired throat depth.
Chambering Rifles for Accuracy (book)$39.99
Third of many planned works that provide instruction in the correct and safe methods of gunsmithing.
Specifically, this essay discusses several methods that can be used to accurately chamber a rifle barrel. In Part I of the book Fred Zeglin teaches you all about accurate hunting rifles and discusses the variables that must be dealt with in order to create an accurate hunting rifle. In Part II Gordy Gritters, famed benchrest gunsmith, shares every secret he has learned over the last 30 years. Gordy finishes the book with a step by step process for bench rest barrel work.
If you are not familiar with how headspace applies to firearms and ammunition you may want to consider another title we offer, “Understanding Headspace for Firearms”.
Each book in the Gunsmith Student Handbook Series will focus on one narrow subject in Gunsmithing. Written with the audience in mind these books are for shooters who want to know every detail of the how and why of gunsmithing. Whether you plan to build guns or not, each book in the series will provide a highly detailed and technical explanation of the subject at hand, in a way that any gun lover will be able to understand. Professional or hobbyist will enjoy this read.
123 pages, soft bound. Printed in the U.S.A.