Read it again Ghosth ...
I don't think he is having trouble with gunnery, he is simply saying that he may be ... say 600 to 800 behind an enemy that is on the 6 of one of his buddies. He wants to send some tracers by the bad guy using his primary guns (still knowing that he might not get a kill shot) causing him to break off his attack. Yet, at the same time, his secondary guns do not have tracers on. Probably cause he wants to use these to start a kill without alerting the enemy.
Xargos ... sounds like a good idea to me ... wether HT will implement it ... thats another story.