Not really scars, but WTF moments.
Leading your target.
Unless your range target has the ability to rotate, folks shooting usually dont practice leading the target thats moving .
Hunting helps solve this with animals like coyotes, or hogs, etc …
When I first started to engage hogs or moving targets at the range, I was off. Static shooting didnt take into acct movement.
I was WTF on rounds missing my aim point with a .45 on a hog. Well, muscle memory didnt take into acct movement. Fast movement.
That has since changed, but the first couple times, you scratch your head in disbelief.