IMO It's mostly a non issue, as most all SD ammunition is designed to meet the same penetration and expansion standards.
regardless of caliber and bullet weight they should all penetrate a certain distance and expand a certain percentage. These will usually all be laboratory test conditions.
Personally I use my own loaded ammunition for carry/SD, I'll put my ammo up against any name brand any day of the week, I do use all new components for SD ammunition.
For the 9mm I shoot 147 grain Hornaday XTP.
NRA Lifetime Member Since 1999
"I ask, sir, what is the militia? It is the whole people except for a few public officials." George Mason