Good info you gave though I do believe your math may be flawed. Good read.
https://www.missouribullet.com/technical.phpThere is a formula for optimal bullet hardness which is simple and it is worth knowing:
Optimum BHN = PSI / (1422 x .90)
The PSI of your reloads is published in the reloading manuals. Take a typical .45 ACP load, using a 200-grain LSWC bullet – 5.0 grains of Bullseye. This load develops 900 FPS and is in common use among IPSC and IDPA gunners. The reloading manual shows that the pressure generated by this load is 20,000 PSI. So, the formula for optimal bullet hardness is
20,000 / 1279.8 = 15.62
There it is! For this application – shooting a 200-grain LSWC at 900 FPS requires that you use a bullet with a BHN of 16 to 18 (round upwards a couple of BHN points for flexibility.)
