The charge wasn't the main reason for the recoil. It was the four steel weights needed to open a 3-4 metre square net at 20 metres, one 19x60mm cylindrical steel weight per barrel giving a total projectile weight of about 900 grains fired from a 4-5 kg gun. The weight of the net is not taken into account as the weights are well clear of the barrels when the net is dragged free.
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