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Dunno quite what you mean by this:
"A case may fail at 70,000 psi"
Without the chamber-walls, I presume a case would fail at 1000 psi!
Case failure, in the absence of any rifle failure, would be markedly affected by breech design, extractor type & fit esp. width of extractor cut, etc.

You are right. Not worded well on my part. Point is that an action design may allow a case failure long before the strength of the action is compromised, and on the other hand an action may have sufficient case support to hold the case together until the whole thing lets go.

In Musgrave's case, they may have 'proved' the action during the design phase, using very stiff measured proof loads and a rigorous scientific measurement process, and simply prove each individual rifle for function as a formality, or perhaps for legal reasons.

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I was told that the process I was observing was the proofing process. As I remember, the fellow firing the gun was not an employee of Musgrave, but rather a regulatory {Proof House?} officer. This was in 1988 so if anybody knows the law in RSA at the time they might shed some light on it.

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