Seriously speaking, other than telling us the time of exposure
of snap targets, there is no special requirement on the time taken
to engage a target and fire off.
A hasty shot is never a good shot. Let's say that you are going to
engage a moving target. What I do is to suck it in, watch the
target move, plant my crosshairs ahead of the target, then
constrict my air passage, slowly leaking out my breathe, and when
the target reaches a known distance from my sights, do a quick
snatch, all the while maintaining the "leak" even after the shot
has been fired. That's due to a need to follow through. You can't
do that with an M-16 though, the trigger pressure is too high, you
risk missing from a snatch, but you can do that with an SSG due to
its very light trigger weight and supported prone position.
Special care need to be taken for trigger modification also. For
stationary targets, smooth trigger action is suitable. For snap
targets, consider a double pressure.
