The AK (forgive if asked before)

[kchuplis]

No: HPFGUIDX 144338

I am wondering, if you have a set of DE's that have no compunction 
about using the AK, why is there not more of it flying around in the 
final scene in HBP (or even in OotP)? I mean, obviously you can't have 
everyone dying in droves, but has there been a canon reason given that 
prevents the curse from being used extensively? Or by certain parties? 
It has to be something other than "it's illegal" since we know the 
other side doesn't care about that and certainly one would have to have 
a certain level of wizardry (but not too high if Draco was expected to 
use it). Just something I have been trying to determine, from a 
writer's POV, of how to get around this problem. I may have missed 
something in my reading.  TIA. 

kchuplis