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Discussion Starter · #1 ·
This is my 457 Varmint woods hunting setup. Grouse and squirrel. I just recently switched to a 16” from a 20” barrel and when shooting standard velocity, some rounds from the same box have a loud “crack” to them, and some are very quiet. I feel like this wasn’t happening with the longer barrel.

I need suggestions for a non-hollow point round that’s also quiet when shooting.

Thank you
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Air gun Plant Tree Gesture Trigger

Air gun Sporting clays Wood Trigger Shotgun
 

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Can i solve this by buying a low velocity round?
I think that would be a great way to test it. The speed of sound is 1,087 fps* so ammo at 1,100 fps with even minor deviation would come in on both sides of that

* OK, yes, I know that it's a bit more complicated than "that's the number" but for this conversation I figured it's close enough
 

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Can i solve this by buying a low velocity round?
It may help. Norma Tac-22 has a little more throttle than other target ammo I've fired.
Look for ammo in the under 1100 fps category. Cci sv may work better for you at that price point. Eley sshp ammo will be quieter, but the accuracy isn't as good on the newer production ammo. RWS ss hp may be a nice option too, just try to find some though. Eley Match has a flat point that will transfer more shock to game. Its usually around 1060fps on average. Going by memory. Kss has that in stock currently.
Its pricy, but for hunting it would last a long time.
 

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Any of the lower priced RWS or Eley target ammo should be close to the accuracy of the Norma with similar greasy bullet lubes. CCI might work out okay, but I wouldn't expect too much from it. I use CCI Subsonic hollowpoints and have gotten better accuracy than the Standard Velocity, but that's out of my Kimber Hunter and might not apply to V's CZ. CCI also has Suppressor which is around 945 fps. RWS Subsonic is very good ammo, I use it too. It is difficult to locate now.
 

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The speed of sound is significantly affected by temperature and altitude, decreasing with colder air and higher altitude. So that snow in the photo means colder and you are no doubt hearing the ballistic crack. I often shoot with a suppressor, so the effect is very noticeable on ammo that is at the "border line" or going supersonic.
 

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If this is the one that just had the barrel cut down, put it back on. Sorry short barrels are loud😒
The colder the weather the lower the speed of sound is. For that reason I hate short barrels and was shooting my 18-1/2” barreled rifle today with a tuner and carbon fiber bloop tube and noticed right away how loud it was. Even with the extension it was twice as loud as the Remington 514 with 25” plus barrel I was also shooting.
 

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Discussion Starter · #12 ·
If this is the one that just had the barrel cut down, put it back on. Sorry short barrels are loud😒
The colder the weather the lower the speed of sound is. For that reason I hate short barrels and was shooting my 18-1/2” barreled rifle today with a tuner and carbon fiber bloop tube and noticed right away how loud it was. Even with the extension it was twice as loud as the Remington 514 with 25” plus barrel I was also shooting.
Yep that’s the one. Personally, the louder rounds are a very small price to pay for the reduced weight and increase in mobility. But if i can have best of both i’ll try!
 

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Plus 1 on the RWS subsonic hp’s if you can find them. The batch I had shot well but velocity was drastically slow out of that lot at around 840fps. A drastic difference in bullet drop at fifty yards over other sv’s.
 

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Sound level changes by the square of the length of the barrel as memory serves so your rifle will be louder. What you are hearing is that some rounds are supersonic and some are sub sonic as they leave the muzzle. ( Speed of sound is approx 1126 fps) Do yourself a favor and get some match/target grade ammo rated at 1070 fps or less. Not only will your rifle be notably quieter with all shots, it will produce tighter groups due to better consistency and lack of some going transonic. p.s. Nice looking rifle
 

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The speed of sound is significantly affected by temperature and altitude, decreasing with colder air and higher altitude.
Also affected by humidity (which is typically low at lower temperatures). The nominal velocity of Tac-22 listed by Norma is 1080 fps. Speed of sound in "dry air" at 30 deg. F is 1085 fps. So indeed you may be right on the verge of that ammo having a MV above the speed of sound -- especially if you think of variations in it. Also, short barrels do make for more sound -- or certainly at least for a perception of louder sound.
 

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It's your ammo that is causing that. If you take a chronograph and see how fast each round is and how loud they are you will know why there is a difference. I had a box of Federal 550 round of 22lr and I bought a new rifle and I thought I had a lemon. I almost gave it away because I could not get it to stay accurate. until I gave it one last try before it was gone and found out the ammo had some weak rounds in that box. Shorter barrels are louder. Just a suggestion.

Signalman 🚦
 
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