Improbable Aiming Skills/Web Comics

A comic of 8-Bit Theater had Black Mage and Red Mage discussing on who'd win in a fight: Bullseye and Green Arrow, based on either's Improbable Aiming Skills. RM then said Green Arrow could shoot several arrows precisely at once. BM argued—and was pinned to a tree by such an attack...
Parodied in this strip of The Last Days of Foxhound with a shooting contest between Sniper Wolf and Revolver Ocelot.
In a recent Better Days strip, the main character manages to shoot two men directly in the head while holding an obese man still with one arm.
- And using a silenced weapon, may I add, which makes it even more ridiculous.
- Of course he can.
Janet of Gunnerkrigg Court can nail an arrow mid-flight.
- Several generations prior, Steadman was able to hit a moving target at the bottom of a very deep ravine, in the middle of the night.
The Adventures of Dr. McNinja: The Flying Shooting Juan
- Mitzi's speciality is precisely aimed demolitions. She uses this skill to land a treasure chest on Dark Smoke Puncher, and get the Doc's katana back to him. And she did this before she knew where they were going to be standing.
One of the characters of Gone With the Blastwave can headshot a plane pilot with a sniper rifle... at the moment that leads the now-unpiloted plane to crash into an allied tank.

Soldier 1: Hey, it worked.
Soldier 2: .... you've been doing this for too long.

Selkie: This comic
Averted with all character that use firearms in Homestuck, two of them simply use More Dakka and huge guns, while Jade has never really been in a fair fight to begin with.
- As soon as Jade has a chance to make her own weapons, she immediately goes for More Dakka and big guns
Fey Winds gives us this one: Four ricochets for a possession gem dangerously close to her brain.
Kit, wielder of the titular The Dreadful, is apparently good enough to shoot the hammer of a spinning gun, thereby causing it to fire.