There are many pressure indicators and today for as cheap as chronographs are folks oughtta have one as another pressure indicator.....also the use of a very precise micrometer to check the diameter of the case just ahead of the extractor groove is a fine pressure indicator.....even 1/2 thou...
I'd like to see a .423 diameter 350 grain accubond for the .404 Jeffery.....I have to go all the way to Australia to get bullets for that thing....well of course they send them to Midway and I get them there.....but never the less.....