Moderator Caliber Size?

[brawler1588]

So speaking to some people I know its recommend to go one size up to help with the chance of not clipping but will going down in size be bad. Using a .30 for a .25 should do well but what about .30 moderator going to a .22 or even a .177? Thank you and stay safe.

 

[Eaglehorn]

NEVER use a moderator that is rated for a caliber smaller than what you're shooting. You're risking pellet clipping and moderator damage (at best). At worst you risk serious damage to the gun and yourself.

 

[brawler1588]

I know that I'm asking the other way using a bigger caliber moderator for a smaller gun. 

 

[davecole]

I’m using a .25 on my WC .177 and it has taken it down to only mechanical noise.
Something is better than nothing.
The volume of air released in a smaller bore is considerably less anyway. 

 

[Yo]

It will still work but not quite as quiet as it normally would if it was only a plus one size. No worries even less chance of clipping. Not like it's a chick or anything then that would be a big problem. Yo!

 

[Pizzaman2976]

Agree with those above. It works, but not as well in my experience as if it was only 1 size smaller. I shoot almost exclusively .177 and I have 2 moderators in both .22 and 1 .25. Both my .22 moderators are quieter than my .25, but the .25 i still better than nothing. 

 

[mtnGhost]

Yeah don't downsize. I had my 22 cal Tatsu on my .30cal Raptor while I was testing a shroud for a 26" barrel that I machined for it. It took me a few (wild) shots before I realized the mistake, but the moderator is officially toast now

 

[Eaglehorn]

Sorry, I misunderstood your question. Using a .30 moderator on a .22 or .177 wouldn't be "ideal" for sound reduction, but the thing with bore size is it has very little influence on sound reduction (we're talking only few millimeters difference here). The main influence on sound is going to be the amount of air coming from the gun itself and the moderator is going to catch most of it before it reaches the end. Using a .30 moderator for .22 or .177 MAY not be as quiet as the same moderator with a smaller exit hole, but for most airgunners the difference will be negligible (plus you get the bonus of still being able to use that suppressor if you decide to switch to a larger caliber).

 

[brawler1588]

That's what I wanted to see my main gun is a .25 so I just got a .30 ronin and .30 emperor and wasnt sure if it would be decent with my .22 I don't want to have to buy more moderators in different sizes. 

 

[JimNM]

I am running a .30 moderator on my .22 PB. It is still more reduction than the .25 Ronin on the .22 PB. Volume of air expansion is more important than the pass through clearances between pellet and moderator, given that the pellet is smaller than the moderator (!)

 

[scratchcoobster]

I switched barrels on my FX Dream Tac .25 to a .22 cal. Put the .25 cal Donny FL moderator (made for FX) on the .22 barrel. Could not get my fps above the 550 range. On a whim I took the moderator off and shot the barrel without it and immediately got 920fps! Put the .22 FX moderator from my FX Crown on the Dream Tac .22 barrel and still got 920 fps.

Why would a larger moderator caliber (.25) clip a smaller cal pellet .22), or at least reduce the fps in half? I thought I was safe using the larger moderator. The moderator does not show signs of wear or clipping internally. Any ideas?