firstly, zeroing is very important. make sure u
zero your rifle properly.
secondly, hold your rifle tightly, hold your
breath and slowly squeeze the trigger when u fire.
thirdly, don't hesitate and stare for too long
when looking through the aperture, once u aligned the front side
tip with the target, hold it there and prepare to shoot. take note
all targets will go down after 3 secs.
fourthly, the way u position yourself in the
foxhole/standing shoulder is very important too. make sure u are
comfortable and the sandbag is adjusted to the correct height.
while at standing shoulder postion, always bring your upper body
forward, as to minimise the impact of recoil.
fifthly, ensure that the magazine is not touching
the sandbag or ground as to minimise the chances of IA. in case of
IA, make sure u are very familiar with IA drills.
lastly, it'll be best that your rifle has a very
bright front side tip that glows clearly in the dark.
yup that's about all, good luck. 
