Make sure you are 275-300TA for rockets.
The top box set corresponds to the AAF MK8\N9\L3 100Mil ring with rocket aid for firing at angles from 400yds. The bottom box set is for level flight at 300TA between 500-1000ft at 400-800yds.
Below are the default WW2 historic reticles with bomb and rocket aid for the game super imposed on chief's sight. They are to game scale for milliradians and the aids work as published from the AAF manuals in the AH3 game physics because Hitech programmed it that accurately.
I chose the K14A fixed reticle with bomb and rocket aid and the L3 reticle with bomb and rocket aid. If they look the same, all AAF gunsights used these patterns imposed into their reticle plate mounted inside the gunsight projection barrel.
The reason for the "V" is each arm represents the wing mounts for the rockets or bombs if you line up favoring one side. Aim center and your rockets or bombs hit 10-15 feet to each side of center. So you want to use a single rocket to hit something, aim using one of the "V" arms as your center line to the target. You prove this to yourself offline with the lead computing dive bombing site enabled while firing a single rocket at a tank drone. Hitech really got the physics very close to real world.
If you are not at 275-300TA before you fire rockets, they will drop like lead bricks.
L3 from the P38L super imposed.
K14A fixed reticle from the P51D, P47N, P47D40.