Thread: Quiet effective sub caliber for hunting, is there such a thing?

All well covered above
The bigger the caliber the louder it will be.
The shorter the barrel the louder it will be.
The heavier the projectile the louder it will be.

The best option would be to get someone to load some leighigh or maker monolithic subsonic expanding projectiles.
But then still remember you are effectively bowhunting terminal performance wise.