Slim I REALLY hope you realize I was referring to my son who actually is a cop, not me. I couldn't/wouldn't run down the hall if a bad guy was here and I had a firearm in hand. The fact is my son does carry a rifle and did just last year run 1 full mile chasing a fleeing felon with his rifle in hand and he caught him, no shots fired! They had an overhead copter calling out radio directions through places patrol cars couldn't quite get to, but normally in close quarters he's relying on his side arm. The point about 9mm having one small advantage was weight, not an issue for regular folks, I was only referring to a specific situation, not mine. In all honesty, being able to carry more rounds of one caliber is probably zeroed out with a heavier load, but I'm not going to be the one to tell him that!The previous post was (mostly) tongue in cheek.
I can really let them get out there on a head start, and get out the 6.5x284. That one can cover a lot of ground.
I'm not a cop. Don't intend to play one on TV either. That being said, I've always considered a side arm as a poor substitute for a rifle. Granted if I was a cop, I would have to trade off the effectiveness of a rifle for the convenience of a side arm most of the time. Living out here in the country now, with several scoped high power rifles (that means larger than 223's btw ). I'm pretty comfortable in my lack of need to chase or run in most circumstances.
I personally prefer 45's for personal defense, but I'm also non-LE, and have no intention of deliberately walking into harm's way, unless someone brings harms way to my home or family. Goes without saying (maybe, maybe not) that my hat's off to those that have to put themselves in those situations. That's not me, so my equipment decisions are different.
Also, physics is physics. While mostly drawing from my long range target rifle and big game hunting field experience, I can say:
Speed is temporary...
MASS is permanent.
Speed X Mass = Kinetic Energy
Give me mass, every time