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Rifles, Reloading, Optics, Equipment
Gunsmithing
Excess headspace - Win M70 30-06 pre-64
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<blockquote data-quote="tobnpr" data-source="post: 1942741" data-attributes="member: 68758"><p>The concern is internal ballistics "101".</p><p></p><p>"Fireforming" has it's LIMITS. You're beyond the thickened walls of the casehead that are designed to handle 60KPSI.</p><p>You're into the very thin walls of the case, that are completely incapable of containing that pressure.</p><p></p><p>On ignition, the case expands....to grip the chamber walls, and the case stretches at the rear in the area of the casehead until it smacks up against the boltface, reseating the primer.</p><p></p><p>The clearance provided/measured by a field gauge is considered the maximum safe clearance for a case to stretch.</p><p></p><p>You think you can push it further? Good luck, and wear your safety glasses.</p><p></p><p>Frankly, anyone that suggests that it's perfectly fine to fire such a rifle is providing downright dangerous "advice".</p></blockquote><p></p>
[QUOTE="tobnpr, post: 1942741, member: 68758"] The concern is internal ballistics "101". "Fireforming" has it's LIMITS. You're beyond the thickened walls of the casehead that are designed to handle 60KPSI. You're into the very thin walls of the case, that are completely incapable of containing that pressure. On ignition, the case expands....to grip the chamber walls, and the case stretches at the rear in the area of the casehead until it smacks up against the boltface, reseating the primer. The clearance provided/measured by a field gauge is considered the maximum safe clearance for a case to stretch. You think you can push it further? Good luck, and wear your safety glasses. Frankly, anyone that suggests that it's perfectly fine to fire such a rifle is providing downright dangerous "advice". [/QUOTE]
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Excess headspace - Win M70 30-06 pre-64
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