Good catch! Yeah I guess since I left && -T $O{target} off of that plain text check line, you can technically use this to shoot binaries as well. Works great too, completely destroys them!

» cp /usr/bin/ls .
» ./ls
double_reload.wav  ls  mag.txt    pump.wav  reload.wav  shotgun.pl  sh
+ot.wav  wall.txt
» ./shotgun.pl -reload -type pump -load buck -verbose -target ls
Loading shot 0
Loading shot 1
Loading shot 2
Loading shot 3
Loading shot 4
Shotgun reloaded!
{
   "pump" : {
      "num_rounds" : 5,
      "load" : "buck"
   }
}
POW!
POW!
POW!
POW!
POW!
» diff ls /usr/bin/ls
Binary files ls and /usr/bin/ls differ
» ./ls
Segmentation fault (core dumped)
[download]

Unfortunately, of course the pattern is not exactly visible in the same way as shooting a -T (ASCII or UTF-8) plain text file. But the destructive capabilities are still there!