All that math makes my head hurt!!!

I'm more of a point and click/pictures worth a 1000 words reloader.

Back in the day the 38spl/wc/bullseye combo was the bad boy on the block. A lot of kabooms were happening so alliant put this out trying to inform reloads of the common mistakes being made.


Quick loads is an excellent program that shows the difference in pressures/bullet seating depth. The 9mm/lee 120gr cast bullet is a popular combo. Unique is good powder for the 9mm that very forgiving/no huge spikes in short start pressures.


Ramshot powder company put this out in their reloading manual. There's a lot of kabooms happening with the 9mm & 40s&w's and fast burning (high pressure spiking powders) powders. A graph with ramshot zip and the affects of different seating depths.


Perhaps you could use your Boils law and compare your findings to what the mfg's and reloading software makers found.