165 gr hollow point lead bullets 38 .357 [38-165-hp-640-358] - $12.43 : GT Bullets!, Fine Hand Cast Lead Bullets
160gr LSWC Hollow Point 38-429 Keith Design [38-429-160--HP-358] - $12.26 : GT Bullets!, Fine Hand Cast Lead Bullets
Take these bullets and resize them to .356 (or order them sized to .356) and load them in a 9mm. The alloy is on the harder side, like 10 BHN (hardcasts are usually 15-22).
I'm interested in where this project goes. Like the OP, I am also an engineer. I love reading and learning about all things reloading. Oh, and good data!