Quote:
Originally Posted by Jerry Harlow
The HEVI-SHOT company uses flax seed as a filler, so everything stays in the shot cup and the seed is placed on top. This would allow you to use the SP10 wad and keep the shot inside and adjust the amount of filler you need for each shell. Flax seed is cheap, less than $5 for two pounds.
Plus you can eat it while reloading and have a healthy heart!
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Putting a filler wad on top of the shot has the opposite effect the OP is trying to achieve as it creates a spreader load. I don't know if Flax seed would have the same effect but I would put it on the pattern paper.
The best ways to tighten a pattern are; larger shot, slower velocity, harder shot (maybe try copper coated), and granulated buffer.
Perhaps you could try a mylar wrap and see what that does.