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I have a write up floating around on the forum somewhere, if you want to use it for reference to get the PW to reload 410 like a champ and not have powder migration problems with spherical powders.

As for old tube style hopper plate, seal on the right, while the newer style square tube powder plate, seal on the left.


To short bus it, we want to reduce the amount of spherical powder to the top of powder bushing to start with, as well as give larger even/flush O ring tensioned surfaces to each other.





Or if you really want to over complicate a power seal design, then here,
 
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