67k is not something that has been run in a case with a .640 case head for 30-40 years Spanner.
The 408 and 375 chey tac were designed to run at normal magnum pressures of around 63k.
I know that my action is safe at 67k because KG has done the proof pressure testing for me
No seriously Greg Duley has loaded it higher to check pressures and signs and found them, so is happy that we are safe at 67k.
I really just don't get why you guys think that you have stumbled on something that other experts in the field have not been able to do to any degree.
All you have done is push the brass and action further into the danger zone, this is not something new, idiots have been doing it for years.
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