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Here is a quote from the article " One of the World's Most Powerful Revolvers Gets Lift from Aerospace Alloys"

"Custom 465 Stainless, developed as a candidate for aerospace components, is a premium-melted, martensitic, age-hardenable alloy capable of about 260 ksi ultimate tensile strength when peak aged. In this condition, it also offers higher notch tensile strength and fracture toughness than other precipitation-hardening stainless grades. It provides, in addition, excellent resistance to stress corrosion cracking.

Ruger made a cylinder from Custom 465 Stainless, then fired 50 proof rounds from each of six chambers (total 300 rounds) at 92,000 psi. This is about 50% higher stress than produced under actual firing conditions."

Hope this answers the pressure question.
Cam

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