.177 vs .22 noise level…

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I would have to agree with PPL in regard to the .177

Mind you my 700 mm barrel .177 Two rifle dialed way back to shoot 10 grain slugs, very quiet ( using moderator )
But amping it a little, 10 - 20 BAR to shoot 13 grain slugs and there is indeed a difference in loudness, even with not more air than needed tune.
Speeds being much the same.
 
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Loudness may correlate with shot count. The higher the shot count the less air per shot and the less unexpected air exiting the barrel making noise. Higher regulator pressure can help by helping the valve close before the pellet exits the barrel. My one 177 has a lot higher shot count but a lower reg pressure and is quieter than the same gun in 22 and 25 (P35s).
 
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I am guessing i have to admit.
I am not able to dial my .22 FX Cyclone very much back other than use transfer port restrictor, and it is the only .22 i have as it technically is illegal for me to own ( it was legal when i got it and i dont accept stupid change to law so i feel good )
Really you should compare this side by side, and of course with same moderator on both rifles,

I use a Finnish made powder burner moderator mainly, my Huma MOD 30 of similar length but slightly larger diameter do not seem to do a better job.
But again a feeling i have.

ATM with my Two i start every tune session with a valve locked rifle as i am backed that much off on the hammer spring, i then turn that in until the balanced valve start to let a little air out, and then go a few clicks more on the adjuster and i am at a speed where adding more hammer dont really do much for additional speed.
 
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daddypaddy,

You need to state the pellet weights to answer your question because the energy in the pellet tells us more than just the velocity. Also, you need to specify if this is a PCP or a springer. PCPs are more efficient with heavier pellets, while springers tend to produce more energy with lighter ones. Too light a pellet and you may go supersonic. Then all bets are off.

A related question would be, which would be louder when producing the same energy? If the barrel length and power plant are the same, the .22 would be quieter because it has more expansion volume. That would make the .22 more efficient and quieter. The larger bore volume can also be achieved by making the barrel longer in the smaller caliber. So, how long is a piece of string?
 
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subscriber said:
daddypaddy,

You need to state the pellet weights to answer your question because the energy in the pellet tells us more than just the velocity. Also, you need to specify if this is a PCP or a springer. PCPs are more efficient with heavier pellets, while springers tend to produce more energy with lighter ones. Too light a pellet and you may go supersonic. Then all bets are off.

A related question would be, which would be louder when producing the same energy? If the barrel length and power plant are the same, the .22 would be quieter because it has more expansion volume. That would make the .22 more efficient and quieter. The larger bore volume can also be achieved by making the barrel longer in the smaller caliber. So, how long is a piece of string?
Click to expand...
10gr-13gr .177 at around 900 fps with an akela.
can i attach a 1/2 20 thread moderator on it?
 
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Bngen3 said:
You can get an adaptor for shroud at donnyfl. Or remove shroud and defuser and thread straight to barrel
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ooooo.. ok, i didn’t know that i could just thread directly to the barrel. thanks! 🫶🏼
you might have just sold me an akela. i’m just doing research and still haven’t pulled the trigger on the gun.
 
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I hunt with .177 already but people are forever asking which is better, so I thought noise might be another factor to add to the list. Just wondering how two identical guns with identical silencers but different calibres would compare, and which makes a bigger "thwack" on impact. I'd guess .177 would be marginally quieter but maybe someone knows different.
 
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