Firstly forget CUP. You cannot work with that unit in any meaningfull way. Look up the CIP Max average pressure in PSI or Kgcm2.

Explosive force (the wrong term as propelents do not explode) or steady state, no matter. Peak force is the critical thing.

"If it looks right, chances are it is right."

With the greatest of respect, with a firearm that is akin to "hold my beer and watch this"

When I gave you the calcs for the 30-40 you will note that I gave a margin of error of 100%. Even at 200% it is still well within range of a 20G action.

If you take the published English thrust figures from past and try to make them stack up agains this method it dosent work. They were done with a base crusher and compared one cartridge to another not to an empirical standard as such. For instence by this method the 416 Rigby comes out at 5.76 tons, whereas in the published data it is listed at 17 tons. So 200% error somewhere.

This just cannot be settled until somebody does base thrust with piezo.

Regards