Your meant to be aiming to hit all 50
whether your C or AA
Its exactly as jamesy has said go out there to learn how to use your kit and the sitting position isnt easy.
Have you done any practising not off the bench but sitting ,ranging shooting are you hitting them in none competition.Because if your not hitting them then your sure not going to with competition nerves and worries
Most of all have fun your not going to at this rate as your mind will be elsewhere.