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Rifles, Reloading, Optics, Equipment
Gunsmithing
Excessive Headspace!
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<blockquote data-quote="NesikaChad" data-source="post: 339067" data-attributes="member: 7449"><p>Here's what I do:</p><p></p><p>I don't own any NO GO gauges. Not one.</p><p></p><p>I buy all my GO gauges from PTG.</p><p></p><p>I have a spool of .001" shim stock made by Starret.</p><p></p><p>Strip the bolt of anything that has a spring or plunger. Drop in your gauge and allow the bolt to go home. It should rotate into battery under the weight of gravity.</p><p></p><p>Now start cutting little postage stamps of shim stock and sticking them to the bolt face with a dab of grease. Keep stacking until the bolt handle no longer wants to rotate.</p><p></p><p>The way I refer to this dimension is "GO plus whatever the number of shims are."</p><p></p><p>This can be a very valuable tool to a guy if he starts doing this from day one, especially with a "boomer" magnum.</p><p></p><p>Say on day one of receiving your rifle you do this and you come up with "GO+.002" for a headspace dimension. Now a thousand rounds later you check and it's changed to "GO+.006". Obviously something has moved. It could be the lugs have peened back, something is wearing, whatever. You at least had a starting point that a GO/NO GO can't provide by themselves.</p><p></p><p>Last, it allows a guy to set his dies up right at the bench. If you measure your chamber and then replicate this by running your die to the same point you should have a more accurate representation of your chamber's depth so that you don't push the shoulder back further than it needs to be. Just plop the gauge in the shell holder with the shims in place and screw the die to the gauge. Perhaps remove a shim or two so that things chamber easily.</p><p></p><p>That's my way. </p><p></p><p>Chad</p></blockquote><p></p>
[QUOTE="NesikaChad, post: 339067, member: 7449"] Here's what I do: I don't own any NO GO gauges. Not one. I buy all my GO gauges from PTG. I have a spool of .001" shim stock made by Starret. Strip the bolt of anything that has a spring or plunger. Drop in your gauge and allow the bolt to go home. It should rotate into battery under the weight of gravity. Now start cutting little postage stamps of shim stock and sticking them to the bolt face with a dab of grease. Keep stacking until the bolt handle no longer wants to rotate. The way I refer to this dimension is "GO plus whatever the number of shims are." This can be a very valuable tool to a guy if he starts doing this from day one, especially with a "boomer" magnum. Say on day one of receiving your rifle you do this and you come up with "GO+.002" for a headspace dimension. Now a thousand rounds later you check and it's changed to "GO+.006". Obviously something has moved. It could be the lugs have peened back, something is wearing, whatever. You at least had a starting point that a GO/NO GO can't provide by themselves. Last, it allows a guy to set his dies up right at the bench. If you measure your chamber and then replicate this by running your die to the same point you should have a more accurate representation of your chamber's depth so that you don't push the shoulder back further than it needs to be. Just plop the gauge in the shell holder with the shims in place and screw the die to the gauge. Perhaps remove a shim or two so that things chamber easily. That's my way. Chad [/QUOTE]
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Excessive Headspace!
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