The reason I ask is not to try it out, but rather to determine what would be "safe" for practical use.
ANSI/SAAMI Z299.3-1993, 18 years old, is on the web from SAAMI. It gives the normal, +P, and "PROOF" loads suggested.
What I've ASSUMED, perhaps wrongly, is that the +P+ really just was a more tightly controlled production and used the top 20% of the +P range rather than the full range.
SAAMI gives 52,000 as the minimum "Average" and 55,500 as the maximum "Average" for proof cartridges. The Service Maximum "Average" is 38,500. SAAMI publishes "Centerfire Pistol and Revolver Definitive Proof Loads should be used for one purpose only: The proof testing of pistols and revolvers."
Remember that NORMAL PRODUCTION variations in chambers and barrels will effect the pressure. Experience has proven +P to be OK in MANY modern firearms produced of appropriate materials.
I like R&D. Given a proper test facility and lots of money, I'd enjoy finding the limits. I have neither. A weapon blowing up in my hand would kinda cramp my style <g>. When a manufacturer says, as I've seen, something like +P is OK in moderation but not as a steady diet, in MY opinion, I'd probably limit myself to about 100-200 rounds in its lifetime. If it said that +P was unconditionally OK, I'd expect the lifetime of the weapon to meet their design criteria with every shot of +P. How many? I don't know that either, but in my thick skull, 10,000 would be a reasonable number.
I deal with industrial hydraulics. Our products are typically designed for 50,000,000 cycles. Shock diminishes that life. Shock ... like a controlled burning of powder in a cartridge ...
As an instructor, you should, IN MY OPINION, follow manufacturer recommendations. As a lab manager, you should ensure that experiments are conducted safely, and AWAY FROM THE PUBLIC.
Just my 2 cents worth ... and probably worth less.