If you fly auto level at Max Cruise from the E6B and pull up the offline target, your fighter's centerline will be alined level with the center of the target. Test your convergence patterns at 200, 300 and 400 if you are looking for pattern densities for air to air against fighters. Pull convergence out past 400 for bombers and ground straffing.
.target range(1-36,000) heading(0-359) azmuth (0-359)
Flying east at Max Cruise to test 300 yards (.target 300 90)
North=0, East=90, South=180, West=180
Each ring on the Offline Target is 10ft wide.
Because of different (initV) between dissimilare rounds like the german MG versus Cannons, you see armerors diagrams showing MG set to 400m and cannon to 550m. This gave a combined trajectory sweet spot 40cm above the gunsight centerline at about 250-300m for close fighter combat with a known 550m convergence spot with the gunsight level line for shooting bombers when the cannon rounds dropped back down through the sight line. Testing combinations of convergence harmonizations at 200, 300, 400 to see how they density pattern on full zoom will give you an idea of what to expect within reason in the game.
The closer into the wingroot your wing guns are like the FW's, your shooting style technique will be more like shooting with a 109 or yak. Choosing your convergence combinations at that point is an attempt to verticaly tighten your pattern between 300-450 since horizontaly your wingroot cannon are only a bit wider spread than your hood MG.
A unique hybrid of this is the C.205. Test it offline against the target with the MG at 325 and Cannon at 400. 200, 300, 400 autolevel and first shoot MG then shoot cannon and watch the patterns.
In this game wing only guns need to have a tight patterning whatever convergence range you choose. I've experimented setting multiple guns 50, 75, 100 yards apart in convergence. 25 yard differences seem to not allow cons to fly between the rounds in the game. Wing gun convergence suffers most from not setting your tightest density to the range at which you fight. Most of us shoot at each other between 250-350.