Thread: kick arse suppresor ?

Originally Posted by Cigar

Yes, but temperature drops as altitude increases, so there is an indirect effect of altitude.
I read something in a hunting or tramping book years back that stuck in my brain - if I recall correctly, it said temperature drops 6.5 degrees for a 1000m increase in altitude, meaning the temp at the treeline is roughly 8 degrees lower than at sea level, all else being equal.

Yeah but some people get confused because in aviation you have Indicated Airspeed and True Airspeed (IAS and TAS). Airspeed indicators rely on pressure, so as you go higher your TAS increases relative to your IAS. So at 0 alt, the speed of sound is around 660 knots (IAS and TAS ), and at 50000 feet it is ~ 570 knots TAS (due to the temperate drop) and 285 knots IAS (due to the temperature drop and decreased pressure reading).

And for some reason this gets crossed over into the belief that pressure has an impact on the true speed of sound (in air).

Originally Posted by Bill999

How much quieter are they than the standard Winchester 40/42gr subs?


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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 bullet hitting the target.

While Eley 38 gr subs are closer to the 40 grainers but are quieter.
Z

One reason when doing proper suppressor sound testing, why a few shots with out suppressor are recorded beforehand . That is allowing to establish the sound pressure and bullet speed for the conditions around the time of the test being carried out.

At 970fps the 45gr CCI Suppressor HP's should stay consistently at subsonic speeds in most 22lr setups, could be worth a look. I've got a box but haven't tried them yet as the std CCI subs work fine for me in the jw15.

Originally Posted by Friwi

One reason when doing proper suppressor sound testing, why a few shots with out suppressor are recorded beforehand . That is allowing to establish the sound pressure and bullet speed for the conditions around the time of the test being carried out.

That should get all the oxygen out of the suppressor too stopping it from encouraging ignition inside the suppressor and getting that first round pop. My Dpt is pretty awesome on the first shot and even better on the second onwards but on the same gun my OD alpine mini titanium suppressor gives a hell of a first round pop but is great second shot onwards. Usually tho I only use one shot so that’s the only one that matters if it’s quiet or not


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As long as the bullet arrives in the animal before he can hear it and react to it is all that matters ;-)