Using the Lead Computing Sight offline against the drones is misleading. The drones are flying between 225 and 250 mph. Computing lead depends on your ability to judge the following as primary conditions:
1. - Their angle of travel relative to yours.
2. - Their speed of travel relative to yours.
3. - Their range relative to you.
Between 45 and 90 degrees to your line of travel the 100mph principle is in effect. This is why most gunsights from ww2 are 100Mil in diameter. They are called 100mph gunsights. At a range of 1000ft(333yds) a 50cal or Hisso20mm will take 1\3sec to travel that distance. During that 1\3 sec, if your target is traveling at 100mph, looking through your 100Mil ring. Your target in 1\3 sec will appear to travel from the edge to the center dot or, 50Mil, or 1 radius.
This means for every 100mph your target is traveling, you lead him by that many radii or 50Mil(s). So 300mph you lead by 3 radii. This holds true from 45 to 90 degrees of your line of travel.
The offline drones are traveling between 225 and 250 miles per hour. So for calculating deflection they are under the 65mph principle or a 70Mil main ring is used. 225-250mph is roughly a lead of 3-4 radii with a 70Mil main ring.
I've tested the above offline and a 70Mil main ring using the lead computing green cross works like the WW2 manuals describe.
In reality, offline, the best way to use the lead computing green cross, is for chase shots to the drones 6, at deflection angles 30 degrees and smaller. Practicing 45-90 degree lead shooting will mislead your judgment when you reach the MA. Since combat takes place at a broad spectrum of speeds tending towards above 250mph. Another misleading tendency from the offline drones is, as your speed of chase in the MA increases above 250mph, more G force is in play between 15-30 degrees and your rounds will not hit where you expect them to from your offline practice.
Go to the TA and find Morfiend. Ask him to let you chase him around at speeds above 250mph. Then using zoom, watch how your rounds fall farther behind his plane in the same deflection angles at 275-350mph that you were destroying the drones offline at 225-250mph. And notice how much harder it becomes to hold enough lead without other factors interfering with your line of travel.
In gunnery speed increases G as you turn. G above 1G standard effects your bullets by causing them to drop shorter than they would at 1G standard requiring more lead and or elevation.
Shooting to 1000ft(333yds) while pulling G, on average, your rounds 50cal and 20mm will drop to the following:
1G - 1.5ft
2G - 6.5ft
3G - 13ft
4G - 20ft
I wish HiTech would give us some control over the speed of our offline drones to help with our gunnery training.