Oh I thought 1050 fps was still subsonic ?
When I say "crack" it's probably just noticeably louder than the 770fps stuff which sounds more like a air rifle level of noise
Oh I thought 1050 fps was still subsonic ?
When I say "crack" it's probably just noticeably louder than the 770fps stuff which sounds more like a air rifle level of noise
Yeah, the CCI Quiet ammo is definitely quieter than other subsonic ammo. I have also tried Fiocchi Long Z (I think!), it is quieter than most at 850fps but still louder than the CCI segmented.
Apparently the first shot of a string is louder due to the "pop" of the oxygen inside the suppressor burning off.
What altitude do you shoot at? My mate in Twizel has a problem with most subsonic brands as the speed of sound is slower at altitude due to the less dense air, so many subsonics are not subsonic in the High Country. I can't recall which subsonic brand he finally decided was reliably subsonic for him, may have been CCI.
If the issue is "enough suppressor", have you tried shooting the suppressor wet? Detach, pour in water and empty it out, reattach, first couple shots are significantly quieter. I super-tuned a small steel suppressor with wire rolled mesh which would retain more wetness. Other option is to use KY gel, this basically will coat the inside of the suppressor with more water than it usually would hold without it squelching about. The water is SUPER effective at absorbing heat from the gases, remember back in science classes about something called "latent heat of vaporisation".
6 minute video, jump to 4 minutes for the bare bones and comparison.
An itch ... is ... a desire to scratch
Had issue with CCI subs going supersonic every now and then in my Brno model 2 ,mentioned it to the gunsmith he suggested cleaning the barrel and it worked,apparently the build up of wax from .22 rounds can make the od bullet go faster due to more back pressure or something.worth a shot..
Thanks. Yes, that is indeed correct. I'll pass it on to my mate, he may have done his tests in the very cold Twizel winter (24/7 hoar frost for weeks on end) and camr to draw the wrong conclusion that it was to do with altitude alone.
Still, his observation remains, that only one brand was reliably crack-free, the others too close to the sound barrier to perform well in NZ-encountered conditions of lower sound velocity.
An itch ... is ... a desire to scratch
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).
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