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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Rem 700 action how much chamber pressure is safe?
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<blockquote data-quote="Bart B" data-source="post: 1164101" data-attributes="member: 5302"><p>Pressure limits are typically set due to cartridge case limits. Cartridge brass tends to extrude starting at about 65,000 cup or 80,000 psi; almost where many proof loads are spec'd to. Coupled with the fact that the last 1/4th inch or so of the case is not supported by anything except the bolt face at peak pressure, peak pressures have to be below that limit for safety. SAAMI specs for peak pressure are not over 65,000 psi average for that reason. Some SAAMI specs are much lower because of typical rifle design for the cartridge and cases that are made and reloaded for them.</p><p></p><p>Remington 700's have been tested to withstand about 140,000 psi before destructing. Winchester 70's at about 130,000 psi. </p><p></p><p>An M1903 low-numbered Springfield was subjected to high pressure tests and it finally blew with a case full of Bullseye pistol powder under a 172-gr bullet. At one point, the bolt had to be hit with a mallet to open it with a case packed full of IMR3031 under a 200-gr bullet.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1164101, member: 5302"] Pressure limits are typically set due to cartridge case limits. Cartridge brass tends to extrude starting at about 65,000 cup or 80,000 psi; almost where many proof loads are spec'd to. Coupled with the fact that the last 1/4th inch or so of the case is not supported by anything except the bolt face at peak pressure, peak pressures have to be below that limit for safety. SAAMI specs for peak pressure are not over 65,000 psi average for that reason. Some SAAMI specs are much lower because of typical rifle design for the cartridge and cases that are made and reloaded for them. Remington 700's have been tested to withstand about 140,000 psi before destructing. Winchester 70's at about 130,000 psi. An M1903 low-numbered Springfield was subjected to high pressure tests and it finally blew with a case full of Bullseye pistol powder under a 172-gr bullet. At one point, the bolt had to be hit with a mallet to open it with a case packed full of IMR3031 under a 200-gr bullet. [/QUOTE]
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Rem 700 action how much chamber pressure is safe?
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