silencer affecting accuracy

[pikk]

ive had a few hundred pellets through my new ultra xl and accuracy is starting to get good , at 30 meters im grouping inside a 5p bit with out a silencer. but silencer attached its about an inch and a half group , theres no clipping , tried a deben whisper and swift stumpy both with same results, silencer off and its straight back to 5p size . any one know whats going on ? or do i just need to run it in fully ? with the ultra i can live without a silencer as its not my main gun and will be used at ranges only

[eyebull]

That's odd. Does the bore look central? Does the thread look ok? What caliber is it?
BSA sell a good mod (the VC) that is adjustable for each caliber, but I wouldn't say to go out and get a new mod until you figure out what the problem is.
My old Ultra always shot beautifully with the mod on. Never fired it much without the mod as it was so loud...

This is a bit left of field but it could conceivably have something to do with barrel harmonics...possibly try putting the mod on, and then adding a weight at different parts of the mod and barrel, to see if it affects grouping.

How do you know there's no clipping btw?

[10/10]

you don't say what calibre if its a .177 try a .22 silencer as this will produce less turbulence upon exit

[pikk]

theres no sign of clipping or paint off, the stumpy pulls apart as well so had a look, both mods are universal , rifle is .177
i had forgot to clean the barrel before i used it (duuurrrr) but done that now so all factory oil is out and its squeeky clean
it is bloody loud with out a mod mind lol

[blooregard]

I think Eyebull is onto something with regards to harmonics, I'm not of the opinion that air turbulence causes too much of an issue with accuracy. With something like an air stripper adjusting the stripper just finely tunes the harmonics.

Out of the blue, what pellets have you tried through the silencer and does it effect them all ?

[Geezer]

Could be barrel harmonics.

Tried a different supressor?