You may struggle to get effective subsonic performance with steel shot. Either struggle to get it subsonic, or struggle to kill with it if it is subsonic.
I am using a poor mans .410 baikal version of what FSS makes. The porting doesn't start until after the forend, it is plenty enough that pets and stock aren't bothered by it but the factory loads are still loud enough that I don't operate as if my shooting activities will be unknown to anyone in the area.
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