g.willikers, we do have a way to measure pressure. Buy the same systems SAAMI and some ammo companies use to test ammo. It'll cost a bundle of sawbucks, but it is doable. SAAMI would probably tell you whom to buy them from.
Here's a less expensive system, but it works best using the test methodology listed in SAAMI documents as far as test barrels and ammo handling procedures are concerned.
http://www.shootingsoftware.com/pressure.htm