How many individual BR bullets drop a shield?

I have been asking this in the BR threads that popped up, but nobody has given a conclusive answer so far.

Anyway, the full question is: how many individual Battle Rifle or (unscoped) Light Rifle bullets are needed to drop a shield? Both are 5 shot kills and have three bullet bursts, so the ammount of bullets to drop a shield is anywhere between 12 and 14 (so in the 5th burst, bullet 13/14/15 will kill if it’s a headshot).

Another question, has anyone compared the precision weapons’ reload times?

Thanks in advance!

I’m too lazy to go watch the videos and figure it out.

You can do it! Then come back and tell us =D