My earliest reloading was done for .38spl/.357mag. It really was the ideal cartridge to learn reloading for, as it's straight walled and the revolver obviously doesn't have any feeding issues like an autoloader.
Anyhow, I'm setup for casting 158gr bullets in .358. I know that's on the heavy side for 9mm, but I do have a CZ75 compact that loves 147gr FMJ bullets. I've read that's partially on account of the additional rifle grooves in the CZ barrels. Anyhow, I've thinking it'd be a cheap and easy test to resize some of existing lead cast bullets down to .356 and see how that goes. Assuming I get the correct lead hardness I think projectile shape might be the only other concern.
I'm not thinking this would be make match grade rounds, but having the ability to turn scrap lead into 9mm pills in a pinch seems worth exploring.
Any wisdom is appreciated.
Thanks
-S