the left barrel is "pointing" low and right relative to the POA and the right barrel is "pointing" low and left realtive to the POA (thus, the barrels are starting out crossed)
under recoil, the barrels want to move "up and out" away from the centerline (POA)
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under recoil, the LB swings up and left, with the bullet exiting when the barrel is parallel to the POA
under recoil, the RB swings up and right, with the bullet exiting when the barrel is parallel to the POA
(the two shots should be theoretically parallel to infinity)
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if your load is too slow, the bullet will exit AFTER the barrels pass parallel and the two shots will be wide apart (but not crossed)
if the load is too fast, the bullet will exit BEFORE the barrels pass parallel and the two shots will be wide apart (and crossed)
Remember (!) : the paths are divergent , the distance between the crossed POIs will get greater and greater with increasing range. Crossing is never okay. draw a box (like below) and map the shots. you need to slightly reduce your charge if they're crossing.
LB too slow_______________RB too slow
......................LB RB................. <------ just right
RB too fast______________LB too fast
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standing, off sticks
standing (freehand) ad 50,75,100,100 yds