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!

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….
For those of you who love the 22 LR, you know there is a wide variety of ammo and chamberings for this cartridge. Below is a chart of the various chamber dimensions that are popular. Yes, there are more than this, but this covers most of what people ask for. 22 Bentz is commonly used…
You hear some things on the phone that really make you laugh when you rent tools. They might not be funny to the average tool user but maybe we need to share them to clear up some misunderstandings? One of my favorites is, “That barrel has been in the lathe forever waiting for the reamer.”…
4D is proud to announce that we have made an exclusive deal with Tyler Jacobs, Owner of Sherman Wildcat Cartridges. We are now the exclusive source to rent proprietary reamers and headspace gauges for the entire Sherman lineup. While Fred Zeglin was working on the second edition of his Wildcat Cartridges book for Gun Digest…
An Ebook that we sometimes send to clients to answer questions: Gunsmith Tools, Cutters & Gauges – A Primer We provide this book because it contains information from the four major reamer and gauge makers in the industry and more. We have no way of knowing the experience level of the customers we are working…
One of the cool things about writing a book is that during the research for the book you learn a lot about people. I was able to interview a number of interesting and well known folks in the gun world while researching P.O. Ackley, America’s Gunsmith. If you would like a little more behind the scene…
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