bit of a weird question. i swear down i read somewhere about the technique of firing the GPMG skywards to reign lead down on a position calculated, often many a mile away. i also thought i read it on the royal marine website.. i take physics, and know about the coreolis effect, spin of the earth etc. and therefore i know that to get a 7.62mm round a few miles away on a raghead would be know easy task. can anyone provide a link, or get me abit more detail on what i heard? much appreciated!