How much is a dab of Utdderly Smooth?

I'm going to try Udderly Smooth in a couple of week with my Mk.III Snider.  I loaded the MagTech 24 gauge shot shells with 65 grains of Goex  Cartridge, 1/2 sheet of double ply TP wad and a .600" pure lead round ball.  I have quite a bit of space left ...
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