The pressures of the discontinued Herter's shells (I think by Cheddite) were surprisingly just below the SAAMI recommended max. of 11,500 psi; likely loaded with very fast burning powder.
As stated, only independent pressure testing can give the pressures of the new Herter's.
Tom Armbrust's contact is:
1108 W. May Ave.
McHenry, IL 60051
815-451-6649
Payment is by check only, and the shells must not be shipped by USPS.
If you send shells, please share the results with us!
A few factory load pressures are at the bottom here
https://docs.google.com/document/d/1...UOZEFU/preview