As others have stated 4100-12 & 4100-12B are the same wad.
I've used this wad for at least 20 years now for 7/8 ounce loads.
Some of my most even patterns use this wad in a WAA hull,Winchester 209 primer, 18.5 grains of American Select powder at 1200 fps and 5600 psi.
The load is right out of the Alliant manual.
Last edited by Matt Stolley; 08-01-2020 at 10:50 AM..
Reason: Auto correct errors
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