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Rifles, Reloading, Optics, Equipment
Gunsmithing
Switch barrel?
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<blockquote data-quote="J E Custom" data-source="post: 165841" data-attributes="member: 2736"><p><strong>Head space</strong></p><p></p><p>Loss of head space is very gradual and if you are only going to change</p><p>2 or 3 times it probably would not matter ,But I assumed you were going</p><p>to change once or twice a year for different types of game.</p><p></p><p>All of the rifles I build have less than .002 and depending on what type</p><p>of action I use I calculate .001 to .002 crush or strech on the first make </p><p>up of the barrel to action.At 90 to 100 ft/lbs.</p><p></p><p>No mater how well the thread fit there will be some ware/upsetting</p><p>of the thread's it may be only .0002 each time but this will add up</p><p>over time and with only .001 head space that would be 4 or 5 times.</p><p></p><p>Of course if your rifle has .004 to.006 head space it may never give</p><p>you problems.</p><p></p><p>A case in point , Some rifles have a extractor cut in the barrel .To make </p><p>this setup you have to make the barrel and recever up several times to</p><p>take the initial stretch/crush out and then lay out the extractor groove</p><p>and index the barrel then remove and mill the extractor groove ,then </p><p>make up the barrel and the action per the index mark .</p><p></p><p>If the action has no threads and is pinned the head space remains the </p><p>same same . But most high power rifles are threaded.</p><p></p><p>Long winded and I hope this explained it.</p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 165841, member: 2736"] [b]Head space[/b] Loss of head space is very gradual and if you are only going to change 2 or 3 times it probably would not matter ,But I assumed you were going to change once or twice a year for different types of game. All of the rifles I build have less than .002 and depending on what type of action I use I calculate .001 to .002 crush or strech on the first make up of the barrel to action.At 90 to 100 ft/lbs. No mater how well the thread fit there will be some ware/upsetting of the thread's it may be only .0002 each time but this will add up over time and with only .001 head space that would be 4 or 5 times. Of course if your rifle has .004 to.006 head space it may never give you problems. A case in point , Some rifles have a extractor cut in the barrel .To make this setup you have to make the barrel and recever up several times to take the initial stretch/crush out and then lay out the extractor groove and index the barrel then remove and mill the extractor groove ,then make up the barrel and the action per the index mark . If the action has no threads and is pinned the head space remains the same same . But most high power rifles are threaded. Long winded and I hope this explained it. J E CUSTOM [/QUOTE]
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