canadianbluebeer
Refugee
AP for shotguns would be silly yes, except for penetrating armor, or thick bone. (like say, a mutated bear?)It was intended for more powerful weapons. We do have armor piercing rounds, we could enable it only on those and only the perks let you shoot through more than one target. Shotguns, no way. Slugs, probably. The perk would still say you can shoot through even more targets though.
A slug is basically a ranged sledgehammer.
Load up a tungsten dart tho... hrmmm... (sabot round? right! were back to silly. FUN mind you, but silly)

a .50 cal non-ap is going to punch through regular walls/doors and critters. Bear bone? *crunch*
AP? Splat to anything short of rebar/steel. (and the rebar is maybe)
alas, we don't HAVE .50cal in the game yet. (without mods)
7.62 that's where AP / penetration is going to be handy.
9mm? close quarters. the way the zeds stack up on TOP of each other, yes, handy. NEEDED actually.
I've sneak shot zeds in head and theres 2 or 3 of them in the same spot!
SO yes, line'em up and perk aka LEARN where, HOW, and what with to shoot'em to take down half a dozen with one bullet.
(short of a 105mm canister round. that's my job!)

oh, since we're getting a proper (sorta) machine gun, you realize we just HAVE to get tracers down the road.
(yes, get performance fixed, but seriously... gotta have it for bloodmoon)