I was trying to have a quiet spotlighting session last night and I fire the first round and it was loud as... Massive crack. I checked the box and it's Winchester .22lr 1065 fps 'subsonic', Hmmm
Anyone else had this issue before?
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I was trying to have a quiet spotlighting session last night and I fire the first round and it was loud as... Massive crack. I checked the box and it's Winchester .22lr 1065 fps 'subsonic', Hmmm
Anyone else had this issue before?
There are several factors that cause this sort of thing, lessor quality ammo going a bit faster than its supposed to is the most likely. Atmospheric conditions also have an effect on the exact speed of sound.
make of ammo ?
Have a read of this thread.....
https://www.nzhuntingandshooting.co....ubsonic-80003/
Winchester, hollow points, can't remember if they were 40 or 42 gr loads. good thread, thanks AllgoodQuote:
Originally Posted by gonetropo
Maybe time to clean the suppressor?Quote:
Originally Posted by slk12
Had that with CCI subs too occasionally
I have had subs going through a hot supressor "cracking" before with cci's. I didnt pay attention to it too much but
Im sure it had to do with the heat.
how short have you made barrel???? wasnt so much an issue back with long barrels but there is a sweet spot where 90% of subsonic stays subsonic,and if you go slightly shorter it wont be...I BELIEVE it accelerates out to so far then starts to be slowed down again
haha its a longish barrel and with the suppressor the gun feels about as tall as me, not sure on the measurement but is far longer than the old 870 which has a 28 in barrel.Quote:
Originally Posted by Micky Duck
had the same thing with CCI subs which is why I went with the very low velocity stuff ( 770 fps) but that seems very hard to find so back to the cci for me.
I had a load first shot cold bore with CCI sub the other day. Put it down to having sprayed the DPT suppressor out with WD40 as they recommend.
Does a 22 barrel get a bit faster as its worn in ?
I had a CCI sub do that last night too. Sounded like a normal .22, not the usualy quiet supressed sound
Air density at different altitudes can change the speed of sound so may also be a factor.
I had the same experience with that remington???viper (yellow packet) sub shit .my old toz17 is very catholic in her ammo feeds but that shit was diabolical .one round went poof like a marshallow witha puncture ,the next put my.223 to shame .the old buck jacko iwas attempting to bowl sat there in amazement as a round skipped past like a drag queen at mardis gras,before a hypersonic round screamed over his swede.Tosay i was disgusted is an understatement . Ive always found winchester subs and dynapoint to be my pet .22loads -bloody deadly on small game .
In saying this though did i read here recently that quality control on winchester could besuss??-must buya couple of packetsd on pension day befor e this whore of a register throws herself at me.
Dirty barrel can cause it as well,build up of wax .
I love chucking a handfull of the .22s in the bonfire when the townies turn up.:on fire:
I ended up returning the faulty box to gun city today. With nine rounds missing they gave me a different box of ammo from a different brand and reimbursed me the difference between the boxes' value. I cleaned my silencer today but it made no difference, so I'm keen to try the new box. Nice folk at GC Penrose.
Apparently the speed of sound depends mostly on temperature and not much on pressure or altitude.
https://en.m.wikipedia.org/wiki/Speed_of_sound
At 20C it is 1125 f/s
At 0C it is 1086 f/s and “Standard Velocity” ammo might creep over that.
I understand there are special low temperature ammo for biathlon to avoid the bullet going across the speed of sound and becoming unstable.
I wonder if this happens more in the autumn and winter. People whi shoot rabbits down in the McKenzie and Central might know more from experience …
I have heard (so take it with a yearly serving of salt) that gunpowder burns faster the older it gets. So if you had some sub-sonics that were close to breaking the sound barrier when they were made you might have a few cracking through it now they're older. Even now when I buy .22 subs occasionally 4 or 6 rounds still breach. So, hard to know for sure, but that's an idea.
I will say when I got the BSA international target rifle project a while back I was noticeably quieter with the nearly 29 inch barrel and subsonics.
Quite surprised after I shortened it to 19.
Little bit more expansion in the barrel and gases cooling maybe
It's ducking cold around here at the moment. Running the 223 suppressor on the 22 is useful (more volume) Between the cold and high-ish elevation (200-300m) it's not unusual to have 2 in 10 rounds go 'crack' rather than 'woosh'.Quote:
Originally Posted by Bagheera
the 18650 batteries don't last as long in the winter, tend to get about 4hrs out of a pair before needing to swap them out.