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Understanding Headspace: Unlocking the Secrets for Safe and Accurate Shooting
By Brady Kirkpatirick Introduction If you’re in the world of firearms, you’ve likely heard the term ‘headspace.’ But what is it, and why is it so vital? My name is Brady Kirkpatrick, the founder of GunMade.com, and I’ve spent years delving into the intricacies of firearms, including the concept of headspace. In the simplest terms,…
Nosler Chamber Reamers & Gauges
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….

MEASURING FOR SCREW-IN CHOKES (Shotgun)
Before accepting a barrel for machining to accept screw-in chokes, you must measure the outside diameter (O.D.) to determine if there will be sufficient wall thickness after machining. “Mike” the O.D. of the barrel and the O.D. of the tap for the particular gauge. Subtract the O.D. of the tap from that of the barrel,…

Sherman Wildcat Cartridges
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…
One way we try to offer customer service…
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…
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!