Pilot Diameter Chart
Copyright 2019, Fred Zeglin, reprinted by permission of the author.



These Charts come from Fred’s book, “Gunsmith Tools, Cutters, & Gauges – A Primer“.
There is so much more in the book, check it out!

Copyright 2019, Fred Zeglin, reprinted by permission of the author.



These Charts come from Fred’s book, “Gunsmith Tools, Cutters, & Gauges – A Primer“.
There is so much more in the book, check it out!

Stuart Otteson wrote two books about “The Bolt Action”, this is Volume I They are considered to be the go-to books for people who want the facts about modern bolt actions. Not only how they work but all the important engineering details. Stuart is a Mechanical Engineer by trade and he analyzed each action in…
There is a lot to learn about chamber prints. We recommend the post on this blog. We are asked for reamer prints on a daily basis. We have never provided them as they do not represent a specific tool. Prints are representative of what you would receive. Reamer makers like all machinists use tolerances when…
Being in the gun business for almost 40 years now I have become acutely aware if the lack of basics being taught in schools. In particular in Occupational Trades institutions. Before you send me a nasty gram defending your favorite school keep in mind I teach at one of these colleges and have friends at…
Several years ago Nosler took nearly every caliber from 26 to 36 to SAAMI. As soon as they were approved we bought all the reamers and gauges. The 26 and 28 Nosler are the only cartridges that share the same headspace gauges in the Nosler factory line-up, all the others have their own specific gauges….
Fred Zeglin released two titles in his new series of instructional books for anyone who wants to understand how guns work. Tailored to students of gunsmithing, whether you are a hobbyist or a professional Zeglin bring over 3 decades of gunsmithing and teaching to the table. These books are clear and concise detailing specific subjects. Lee…
We have seen a ton of demand for Ackley calibers since the publication of Fred Zeglin’s two new books in 2017. For this reason we have created a category on the 4D web site to separate out all Ackley cartridges making them easier to find. They still appear in the standard caliber listings as well….
No products in the cart.
|
Uploaded
Failed
|
![]() |