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Rifles, Reloading, Optics, Equipment
Reloading
Case head separation?
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<blockquote data-quote="nicholasjohn" data-source="post: 1993656" data-attributes="member: 109113"><p>Look over some of your other once-fired cases, and you'll see pretty much the same thing - just maybe not as pronounced. This one looks pretty normal to me. Also, if you measure the diameter of a case head immediately above the extractor groove, it may be a tiny bit smaller than the brass you have been shooting, so there may have been a little more expansion of the case walls to fill your chamber than what you're used to seeing. This would make the pressure ring more noticeable to the naked eye. </p><p></p><p>To make this measurement, you're going to need to do it on an un-fired case, because both the rim and the pressure ring are bigger around than the case head once the case has been fired. Then compare that to other brass you've used, and you may find that it's a little smaller at the head. ( On a fired case, you would need a blade mic to get down between them to make the same measurement, since the a regular micrometer has posts that will be measuring at the larger diameter.) You won't really need to get that measurement on a fired case to learn what you want to know. Also, the composition of the brass may be a slightly different alloy than other brands of cartridge brass, and this may make the pressure ring more obvious to your eye.</p></blockquote><p></p>
[QUOTE="nicholasjohn, post: 1993656, member: 109113"] Look over some of your other once-fired cases, and you'll see pretty much the same thing - just maybe not as pronounced. This one looks pretty normal to me. Also, if you measure the diameter of a case head immediately above the extractor groove, it may be a tiny bit smaller than the brass you have been shooting, so there may have been a little more expansion of the case walls to fill your chamber than what you're used to seeing. This would make the pressure ring more noticeable to the naked eye. To make this measurement, you're going to need to do it on an un-fired case, because both the rim and the pressure ring are bigger around than the case head once the case has been fired. Then compare that to other brass you've used, and you may find that it's a little smaller at the head. ( On a fired case, you would need a blade mic to get down between them to make the same measurement, since the a regular micrometer has posts that will be measuring at the larger diameter.) You won't really need to get that measurement on a fired case to learn what you want to know. Also, the composition of the brass may be a slightly different alloy than other brands of cartridge brass, and this may make the pressure ring more obvious to your eye. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Case head separation?
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