I can't really do that comfortably. However, I would be very confident that 23 to 25 grains of Red Dot under a card and filler wad and 1 1/8 or 1 1/4 ounces of lead shot would be a fairly low pressure and safe load, that would be reliable for ignition. If the plastic wad were used and it fit fairly tight in the shell, I would stick to about 21 or 22 grains of Red Dot.
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