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Rifles, Reloading, Optics, Equipment
Reloading
Flattened primers?
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<blockquote data-quote="AZShooter" data-source="post: 872417" data-attributes="member: 5219"><p>How to correct excessive headspace? </p><p></p><p>The gunsmith must make some measurements. A headspace go and no go gauge is used if available. If not the measurements should be able to be accomplished by comparing unsized fired brass vs virgin brass. </p><p></p><p></p><p>The barrel is unscrewed from the reciever using a barrel vise and an action wrench. Then the barrel is centered in a lathe chuck. Metal is machined off the end of the chamber. The same amount of metal is machined from the shoulder moving it forward. If there is an extractor notch in the end of the barrel, it has be indexed and machined deeper for bolt face clearance. If any of these cuts remove more metal than required then a reamer must be used to cut the proper chamber depth to achieve proper headspace. </p><p></p><p>How do I know this? I did my first barrel with crude measurement devices and cut the chamber too deeply (same as yours, excessive headspace). I then sopme off the end of the barrel to shorten the chamber length and over did that. I then ran in the chamber reamer and went too deep again! I eventually got it. Later on I purchased some tooling to help me make the proper chamber the first time. Nothing like screwing up to truly understand the process. </p><p></p><p>Basically the entire barrel is set deeper into the reciever with the end result being a shorter chamber.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 872417, member: 5219"] How to correct excessive headspace? The gunsmith must make some measurements. A headspace go and no go gauge is used if available. If not the measurements should be able to be accomplished by comparing unsized fired brass vs virgin brass. The barrel is unscrewed from the reciever using a barrel vise and an action wrench. Then the barrel is centered in a lathe chuck. Metal is machined off the end of the chamber. The same amount of metal is machined from the shoulder moving it forward. If there is an extractor notch in the end of the barrel, it has be indexed and machined deeper for bolt face clearance. If any of these cuts remove more metal than required then a reamer must be used to cut the proper chamber depth to achieve proper headspace. How do I know this? I did my first barrel with crude measurement devices and cut the chamber too deeply (same as yours, excessive headspace). I then sopme off the end of the barrel to shorten the chamber length and over did that. I then ran in the chamber reamer and went too deep again! I eventually got it. Later on I purchased some tooling to help me make the proper chamber the first time. Nothing like screwing up to truly understand the process. Basically the entire barrel is set deeper into the reciever with the end result being a shorter chamber. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Flattened primers?
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