The rumer I'd heard is that the super alloy they've used in the Super redhawhk 454 and 480 is going to be used in the Super blackhawk. That makes more sense. I can't wait to see a factory 5 1/2" 480

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