For example I made some numbers up and plugged them into a ballistics calculator.

I figured out of a 10.5" barrel I might get roughly 2500 fps using 55gr bullets.



If you notice at 100 yards I still would have over 2100 fps which I am sure would be enough to do major damage.

That would be about equivalent of shooting a bad guy at 250 yards with a 55 grain bullet out of a 16" gun.