If you want a wider grouping of your projectiles, just set your convergence for 250m, and start shooting at 200. That will significantly increase the size of the beaten zone on the target aircraft.
So-called 'point' convergence, like any other form of harmonization, is intended to concentrate your projectiles on your point of aim. This is to some extent theoretical because speed, recoil and gravity all conspire to widen the grouping of your shots. Concentrating the impact point of projectiles in air combat greatly increases the potential for a catastrophic failure of the target air frame. If the pilot is part of that catastrophic failure so much the better, however, as far as I know, pilot targeting has never have been considered a realistic proposition when formulating convergence. That would be like shooting ducks on the wing with the intention of head-shooting them. While, that would be ideal, it's just not realistic. That said, many ducks do end up shot through the head.
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