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I also have a 450x400x3" but it is a double rifle. Small amounts of powder in such large cases require some thing over the top. If I remember correctly they don't recommend using any type of wad or filler with trail boss. I also remember reading that trail boss recommends a minimum of 70% case capacity. I know it is light and fluffy and about half the density of most rifle powders. I would probable contact the manufactures for advice.
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