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There are some differences in measuring pressure between the old cup methods, and the newer piezo ( and strain gauge) methods.
Still, those differences remain theoretical for all but a few reloaders. For the "common loaders", velocity is the best pressure gauge out there (and it's a good one).
If you are higher than book speed, you are higher than book pressure. So, in my opinion, if you have a standard rifle, a chrony will answer your questions.
That said, there are tremendous differences within the belted brass universe. For example, I have a 7mag, and FC brass holds 83 grains of water. Wby brass holds 89.5 grains! That's 8% difference!
Before you lose too much sleep, see what the case capacities were of the brass they used. It may have been substantially different from your brass. Likewise, a long throat (seating bullets long) can have a significant impact on loading data. FWIW, Dutch.
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