Kenia,
What you see and what the other guy sees arent always the same,mostly do to latency.
It doesnt matter what convergence a pilot uses if you get hit, you get hit. Personally 300 yds would be a long convergence for me,most my guns are set between 275 and 150 depending on the gun and it's placement. I use 150 on the 30 mm hubgun of a 109,but thats just "my" preference.
So lets say you have a spit with wing guns set to 300 yds. At 600 yds the rounds are the same distance apart as when they leave the barrels,they've just crossed sides. Now how much they drop is a different thing and depends on muzzle V and the amount of dispersion coaded in.
hope that helps.
