There is no set of laws written in stone. If a civilian shoots a guy from 75 (or 50 it 25 ft) in the back because the guy is threatening people or stealing a car.... probably not going to end well for the civilian.

A civilian shoots a guy from 75 (or 50 it 25 ft) in the back because the guy has a rifle and is shooting into a crowd! Not going to be a problem

I regularly practice at 25 yards because it the longest distance readily available range. One thing I learned is that I need new prescription glasses

Here's a target. Mine is bottom right, my friend is top left. Both targets shot with Sig 2022 9mm at 25 yards. I practice and can barely see the center at that distance. I just see a black blob. My friend has excellent vision but rarely shoots

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