The barrel length has a pretty significant affect on sound level in my experience, even in subsonic calibers. The longer the barrel, the nicer it will sound.
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This works for me ! A 9mm , 4.5" barrel with integral suppressor and 147 gr 950 fps subs is real quiet .What barrel length are you thinking about getting? A 9" 300blk running subs is still uber quiet:
The same reason you shoot any caliber suppressed. So it's not as loud.For Hunting.