So the rest of us are just chopped liver I guess. I can shoot quite well thank you. If you think there's no accuracy difference in ammo I have doubts about your ability to shoot accurately at anything more than a few feet away. Most defense situations occur within a few feet. But certainly not all of them.
I found this in an article in
Guns And Ammo. I suggest you take it seriously.
"Just changing ammo can have a dramatic effect. For instance, many .45s don’t like GI-issue ball. I’ve switched to commercial loads (Federal, Winchester or Remington) and watched groups shrink by half."
Then there's the guns that are used for hunting. They certainly need to be as accurate as possible especially if you're shooting more than a few yards. The difference between putting a bullet in a squirrel's ear at 50 yards and missing that squirrel completely will almost certainly be affected by ammo to one degree or another. And yes I have put a bullet right behind the ear of a squirrel at 50 yards. I didn't aim for the ear. I aimed behind it because that's where the brain stem is. The difference between the ammo I used and something like Remington Golden bullets could easily have been six inches or more. I've won 15 out of the last 17 rimfire competitions I was in. And accuracy does make a difference in real world shooting. It's the difference between dinner and missing a squirrel with the wrong ammo.