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Rifles, Reloading, Optics, Equipment
Reloading
Body sizing? A necessary step?
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<blockquote data-quote="Bart B" data-source="post: 519630" data-attributes="member: 5302"><p>That ridge is caused by any case whose diameter in front of the belt is smaller than the chamber at that point. What happens is the case is pushed back against the bolt face when its fired leaving a gap between the front of the case belt and the front edge of the headspace ridge in the chamber. When pressure peaks, it pushes the case out as far as it will go between its belt's front edge and the headspace ridge in the chamber. this may be one to several thousandths of an inch depending on the chamber headspace dimension and the head to belt front on the case.</p><p></p><p>My belted case rifle has its bolt face quite large. All my 30 caliber magnum chambers have been at SAAMI specs and therefore larger than new or full length sized cases. But the belted cases get pushed off center at the back end of the chamber from the extractor pushing them there. How much depends on how much clearance there is between the chamber and case at the case pressure ring. When the fired case belt clears the chamber as its extracted, the extractor pushes its rim against the bolt face walls. All chambered cases have their back end pushed against the chamber which puts the case center a bit off the chamber center. Doesn't hurt accuracy at all.</p></blockquote><p></p>
[QUOTE="Bart B, post: 519630, member: 5302"] That ridge is caused by any case whose diameter in front of the belt is smaller than the chamber at that point. What happens is the case is pushed back against the bolt face when its fired leaving a gap between the front of the case belt and the front edge of the headspace ridge in the chamber. When pressure peaks, it pushes the case out as far as it will go between its belt's front edge and the headspace ridge in the chamber. this may be one to several thousandths of an inch depending on the chamber headspace dimension and the head to belt front on the case. My belted case rifle has its bolt face quite large. All my 30 caliber magnum chambers have been at SAAMI specs and therefore larger than new or full length sized cases. But the belted cases get pushed off center at the back end of the chamber from the extractor pushing them there. How much depends on how much clearance there is between the chamber and case at the case pressure ring. When the fired case belt clears the chamber as its extracted, the extractor pushes its rim against the bolt face walls. All chambered cases have their back end pushed against the chamber which puts the case center a bit off the chamber center. Doesn't hurt accuracy at all. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Body sizing? A necessary step?
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