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Bit hard to define. The CCI 40 or Eley 40/42gr subs still have a bang with a silencer, The CCI CB's 29gr at 770 fps in my bolt action the loudest sound is the firing pine and the thump from the...

Have a look at Shootingstuff. To see if their ammo shipment has landed.
They used to have the Eley 38gr hp hunting subs that are noticibly quieter than the cci ones.
( well not as quiet as the CCI...