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<blockquote data-quote="Larry Morgan" data-source="post: 2805634" data-attributes="member: 4676"><p>Also note that the Hornady type headspace comparator that clamps to your calipers cannot measure absolute headspace, it can only do relative measurements. It's designed for you to take a fireformed case and use that as the comparison to set the headspace on sized cases. Only way to check against SAAMI spec is to get a case gauge, which I'd highly recommend. </p><p></p><p>I set mine back about 0.001" after every firing. You can also put me in the column of "bullocks" when told to use a FL sizer as just a neck sizer by backing it out a little (I've had multiple people tell me to do this). Unless the diameter of your chamber in your gun is at min already, the case will grow outward. Unless your FL sizer's diameter happens to be matched to your chamber's diameter, it will shrink the body and make the length grow. My rifle is right at min headspace, plus a thousandth or two. If I take one of my fired cases and run it through the sizer without hitting the shoulder, it will not chamber again until I bump the shoulder back.</p></blockquote><p></p>
[QUOTE="Larry Morgan, post: 2805634, member: 4676"] Also note that the Hornady type headspace comparator that clamps to your calipers cannot measure absolute headspace, it can only do relative measurements. It's designed for you to take a fireformed case and use that as the comparison to set the headspace on sized cases. Only way to check against SAAMI spec is to get a case gauge, which I'd highly recommend. I set mine back about 0.001" after every firing. You can also put me in the column of "bullocks" when told to use a FL sizer as just a neck sizer by backing it out a little (I've had multiple people tell me to do this). Unless the diameter of your chamber in your gun is at min already, the case will grow outward. Unless your FL sizer's diameter happens to be matched to your chamber's diameter, it will shrink the body and make the length grow. My rifle is right at min headspace, plus a thousandth or two. If I take one of my fired cases and run it through the sizer without hitting the shoulder, it will not chamber again until I bump the shoulder back. [/QUOTE]
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