Moderators

[wymberley]

If you have a max' level sub 12 ftlbs which is moderated for shorter ranges and you are not a DFoF does one really need a mod' for 50 plus yards with a 30 ftlbs max burp?. Have to say I'm playing years of catch-up but I can't remember any need some 60+ years ago.

[Spr1985]

Not sure what the abbreviations are but if the question is……is a mod necessary on a sub 12 then I would say yes. My .22 bsa r10 is massively quieter with the mod on than without . 

if that’s not the general gist of the question the. My apologies and I’ll leave it to those that know better. 

[Mice!]

I tried my rapid years ago without the mod on, I only tried it once though.

[wymberley]

5 minutes ago, Spr1985 said:

Not sure what the abbreviations are but if the question is……is a mod necessary on a sub 12 then I would say yes. My .22 bsa r10 is massively quieter with the mod on than without . 

if that’s not the general gist of the question the. My apologies and I’ll leave it to those that know better. 

Hang in there! 

I thought I was out of touch with the media jargon - DFoF = dedicated follower of fashion.

As you have a moderated sub 12 (as have I), would you feel the need for a mod' on a 50+ yard usage rifle with no more than a 30ftlb max bang?

[humperdingle]

The fps of any given pellet is probably more relevant, if they are not subsonic.

 

[Mr.C]

Really depends on the gun doesn't it. My 22 steyr runs 620fps but is so loud I'm contemplating ear plugs. 

Never had a problem with an AA. 

 

[scarecrow243]

the speed of sound in the air is 343 metres per second  so if your pellet is going faster the target would be hit before the sound reached it hope this helps

[wymberley]

16 minutes ago, scarecrow243 said:

the speed of sound in the air is 343 metres per second  so if your pellet is going faster the target would be hit before the sound reached it hope this helps

Yep, but I don't think that our local bunnies are that smart. To travel some 50 yards the sound will take c0.133 seconds, my pellet if launched at the 900 ft/sec to do the same would take c0.187 secs. That's a lot of info to process in 54 ms.

37 minutes ago, humperdingle said:

The fps of any given pellet is probably more relevant, if they are not subsonic.

 

Good point. 

But pellet at 900 ft/sec max

[scarecrow243]

i would still use a sound moderator   i use one on my .22  storm sub 12 its very very quite  i also use one on my stealth .25 f.a.c.  if i did not it would scare every thing around

[GingerCat]

Given the crack you get with a sub 12 pcp I would say yes for sure at 30. It won't be quieter without it. If one shot and home is your thing then leave it off. 

Springer is debatable but those I strapped a can to were better for it, particularly the 99. Albeit it you need someone else to fire it whilst you stand away a few feet to appreciate it. 

[Ultrastu]

So .the sound volume out of the muzzle depends on the volume of air being released . Obviously that volume is at a   pressure greater than atmospheric .which will be around 1 bar .

The lower this volume of air is and consequently the pressure of it when it exits the muzzle the quieter it will be .

So if you have a long barrel say 18 inches .the air pressure has  dropped  inside the barrel more than a short 12 inch one . A  .22  barrel is 25% larger in diameter than a. 177   and is equivalent  to being 25 % longer. Hence why a.22 pcp is more air efficient than .177 

Basically if you shoot a long barreled. 22 it will be alot quiter than a short barreled  .177 .

Years ago we shot long barreled  .22 springers.   A spring gun actually uses a higher pressure but lower volume air pulse than a pcp so is quieter again .

It's up to you to decide if the rabbits can hear it ..

But I have watched rabbits duck a sub 12. 22 pelllet at around 40 yds plus  

So there reaction time is very fast .

Never see it with a .177 .

[Ultrastu]

To put this into context. 

I use moderators on all my pcps .sub 12 and fac .except the .25 fac  this runs at 45 fpe but has such a long barrel ( 24 inches )- and a big bore that the air expansion is mainly done in the barrel. Also I take rabbits up to 100 yds with it .and nothing around that distance  takes any notice of it .there is a small empty shroud on the barrel but it only does a bit of work as there isn't a lot of crack to silence .

[wymberley]

5 minutes ago, Ultrastu said:

So .the sound volume out of the muzzle depends on the volume of air being released . Obviously that volume is at a   pressure greater than atmospheric .which will be around 1 bar .

The lower this volume of air is and consequently the pressure of it when it exits the muzzle the quieter it will be .

So if you have a long barrel say 18 inches .the air pressure has  dropped  inside the barrel more than a short 12 inch one . A  .22  barrel is 25% larger in diameter than a. 177   and is equivalent  to being 25 % longer. Hence why a.22 pcp is more air efficient than .177 

Basically if you shoot a long barreled. 22 it will be alot quiter than a short barreled  .177 .

Years ago we shot long barreled  .22 springers.   A spring gun actually uses a higher pressure but lower volume air pulse than a pcp so is quieter again .

It's up to you to decide if the rabbits can hear it ..

But I have watched rabbits duck a sub 12. 22 pelllet at around 40 yds plus  

So there reaction time is very fast .

Never see it with a .177 .

Nice one; food for thought. We’re not inundated with rabbit here and more often than not it’s shoot one and then wait. If two then come out I’ve always noted that the whack of the strike and the target’s antics have then had the biggest adverse effect.

[Spr1985]

1 hour ago, wymberley said:

As you have a moderated sub 12 (as have I), would you feel the need for a mod' on a 50+ yard usage rifle with no more than a 30ftlb max bang?

I appreciate your question is distance specific, but for the purpose of what I’m going to say distance is irrelevant to me :- after hearing the crack from my sub 12 pcp in open space I will always use a moderator for the sake of my ears and anyone else around me. In my eyes just the sensible thing to do. 

[old man]

FWIW, I forgot to post about the 2 from 2nd May.

I popped 2 within 3 minutes both in the same location at 50yds with the AA 410 xtra using AA fields without the moderator?

Could have been distracted by  their kiss chase?

[Ultrastu]

My record is 10 successive rabbits with a ten shot magazine .on a new perm that hadn't been shot before .I came round a corner to find about 15 rabbits out feeding  between 20 and 35 yds away .I shot the ten in less than a minute  and was reloading as the last of the bunnies decided to hop away .

This was very near a busy road so i guess loud noises don't bother them .

Either way my silenced .177 was deadly that evening .

[oldypigeonpopper]

Hello, FAC air at 30 ft llbs will benefit from a silencer, does it have to go on your ticket ?

[scarecrow243]

1 hour ago, oldypigeonpopper said:

Hello, FAC air at 30 ft llbs will benefit from a silencer, does it have to go on your ticket ?

yes it does just like any f.a.c.  rifle moderator

[oldypigeonpopper]

1 hour ago, scarecrow243 said:

yes it does just like any f.a.c.  rifle moderator

Ok thanks, 

[Gas seal]

Hi wymberley if you zero your rifle with the moderator on you may have to zero it again if you remove it. When testing different pellets l tried some without the moderator I’m sure they were firing high. I changed from shotguns to air gun for the last six weeks shooting pigeons from trees in a rape field and the last week decoying them on the field., to many leaves on the trees now.  I wouldn’t have turned out without a moderator on the gun.My pellets travel about 700ft sc and I’ve not seen anything move out of the way of the pellets. I know what you mean about the (smack ) when hitting your target l often use this to move rooks when one is hit the others move and don’t return, I use 22 rim fire CCI quiets they also travel at about 700 ft sc the same nothing has moved out of the way of them. 

[THEINVISIBLESCARECROW]

Need one ? I'll say yes. Sometimes I shoot without. POI can sometimes be different depending on rifle / mod combo so worth checking.