In the effort to avoid any more rehashing of old arguments than necessary, I’ll just say this simply: from a personal defense standpoint when using a pistol in a service caliber such as 9mm, .40 S&W, or .45 ACP all modern hollowpoint ammo regardless of grain weight and velocity such as Winchester Ranger, Golden Saber, Speer Gold Dots, et al is designed to meet or exceed the FBI penetration standards. So my 147 grain 9mm is going to penetrate 12+ inches of ballistic gelatin after defeating common barrier materials and still give reliable expansion. Same as your .40, or your .45, or your 9mm in a different bullet weight.
I’m begging you people, please stop all the caliber wars. Can’t we just get a long gun?