Older .44 Mag ammo is noticeably hotter than it is today. If you haven’t run any of the current crop of factory .44 Mag ammo over a chronograph, you should. It will be eye opening and underwhelming. There is no reliable CUP to PSI conversion, but it is my understanding that 40,000 CUP is considerably higher than 36,000 PSI.
Sorry for the thread hijacking.
Your understanding of the pressure guns and the type and how they are referenced is flawed.
Give me some actual examples of rhe chrono results of the old ammo you are talking about. Not some hearsay of the chronoing of ammo that has been kept in questionable storage etc..
