Not trying to argue . There is plenty of data on the Hodgdon site you can compare for yourself .
Because Bismuth and Lead are close to the same density and hardness , as say Lead and steel . There may not be big difference , but there is difference . Enough difference that when you are shooting these loads in guns that require low pressure ammo it can easily put the load over pressure for said gun.
Better yet call the people that do the actual ballistic testing . I'm sure they can explain better than I can.
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