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Two things are gonna make a big difference in the sound level with subsonics.
Powder selection. Small charges of fast burning powder will be much quieter than bigger charges of slower burning powder. I have found the Vhitavuori powders to be very quiet.
The baffle design in the silencer is critical too. Baffles meant to work high pressure gas will not be nearly so good with a low pressure system like a subsonic 300 W.
The best baffles for low pressure systems are long stepped cones with a shear cut at the apex.
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