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The formula for recoil includes the weight of the charge (because it has weight and mass, ay?), too.
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No...not for this particular discussion.
What he is suggesting is that the 2 loads are similar pressures. The weight of the charge has no bearing on recoil if both loads are the same pressure.
If the charge is reduced in a load it will reduce that loads pressure, velocity and recoil. If the pressure is the same and the bullet weight is different, then the heavier bullet will have more recoil but less velocity than the lighter bullet.