I picked up lyman's new blackpowder loading manual. On some of the loads Sam Fadala used a wonder wad between the powder & conical bullet. As I understood at ignition the conical bullet expands to grip the rifling, Why use the wonder wad, wouldn't this prevent that?
I have used wads on flat based conical bullets but I do not use them on hollow based. It is as you were saying, the base has to expand. On flat based, the wad protects the base of the conical and helps with powder pressure spikes I was told.
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