I can not see how you aren't asking for trouble with that set up if you aren't useing plastic wads? Uncontained shot coloum travelling down a ported barrel can't be good surely.
When loading plastic cases, a fibre wad would produce less pressure than a plastic wad to my mind, due to not sealing as well.
Your wad coloum won't be much anyway more than likely due to there not being a lot of room in the 410 case,
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