Re:Hypersonic HAWC missile flies, but details are kept hidden
by nautilius on Tuesday September 28, 2021 @10:31PM
(#28689667)
What kind of pressures do you have in a barrel?
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Re:Hypersonic HAWC missile flies, but details are kept hidden
by ashtonkem on Tuesday September 28, 2021 @11:02PM
(#28689833)
Lots! The maximum chamber pressure allowable for a given civilian caliber is set by one of two regulatory bodies, SAAMI (US) or CIP (EU). In some countries firearm barrels will be tested (“proofed”) at 125% of set pressure to ensure consumer safety, and then stamped with a proof house specific mark. My understanding is that the US doesn’t require this, but any imported barrels will be stamped.
Specifically CIP sets the maximum pressure of 22lr at 24,646 psi. An extremely high number considering, but pretty pedestrian compared to other cartridges. For example NATO sets a maximum pressure of 62,366 psi for its primary rifle caliber, 5.56x45mm. It’s genuinely amazing that rifle barrels don’t regularly explode, to be honest.