s410 snags

[avfc1982]

as above, if you have any form of silencer or muzzle brake fitted my bet is your clipping pellets on the exit fractionally.

[shaun5609]

Cheers for you help people. It would seem that the moderator was causing the problem. So next question, is it broken, do I need another one or am I being special and there is an easy way to eliminate the problem?
Cheers again

[shaun5609]

So I have it at quite a Good zero at 25m in the back garden. The only problem I have now is a massive fluctuation in power. About 1.5flb between 180 and 120 bar. Does any one have any ideas what could be wrong, or is it just settling in post fiddling?
Cheers in advance

[Blackbaronfish]

When you say polished...what have you done?

BBF

[singlespeed]

Maybe worth while posting up a full shot string showing FPS from 180bar fill down to 100 (or where the speed drops off a cliff)
Its a bit of a pain as its typically waste of 80-120 pellets, a fill of air and probably over half an hour. However it's great for identifying problems and confirming your legal over the full pressure range. It then points out the ideal fill/refill pressure, so your saving in the future

Outlet valves have been know to deform over time and seem to cause a more pronounced curve, compared to new.
If your saying a large shot to shot variation anywhere then that probably points to something sticking.

[shaun5609]

I have polished the rail, following the YouTube link mentioned in previous threads. Also the trigger and adjusted it. I will look at doing the string with my combro at the weekend, as it was a little higher than I would have liked it earlier!

[Mark112]

Maybe worth while posting up a full shot string showing FPS from 180bar fill down to 100 (or where the speed drops off a cliff)
Its a bit of a pain as its typically waste of 80-120 pellets, a fill of air and probably ofer half an hour. However it's great for Iidentifying problems and confirming your legal over the full pressure range. It then points out the ideal fill/refill pressure, so your saving in the future

Outlet valves have been know to deform over time and seem to cause a more pronounced curve, compared to new.
If your saying a large shot to shot variation anywhere then that probably points to something sticking.

Hi,

+1 for the above post. You will get a variation over the fill range even with a new rifle. This is the normal 'power curve' of an unregulated rifle and at the target makes less difference than you may think. To lessen this curve though you may well benefit from a new exhaust (or firing) valve. It made the power curve on my 2005 .22 carbine much less pronounced. In my .177 classic heavy pellets have a much less pronounced curve than lightweights!

Mark

[shaun5609]

Again, sorry to sound a bit special, but which item is the firing valve? Is it the larger brass looking cylinder with the screw tread which sits in the air cylinder? Also which bit deforms?
Cheers
Shaun

[Stoohundred]

The firing valve stem is inside the large brass tube (firing pot) that's inside ur cylinder, if you unscrew it (the firing pot) and have a look you will find the valve stem and a spring inside. Be sure to mesure it accurately before you unscrew it so you can put it back to its setting if you require to as this will effect the power output.

Note there is a grub screw located under the gauge block that you will need to loosen in order to unscrew the brass firing pot, so you will need to remove the gauge block from the action.

The valve stem has a hard plastic bit at one end which is susceptible to ware and tear and is worth putting a new one in if you are gonna take it apart, they are fairly cheap.

[poguemahone]

as singlespeed said, post up a full shot string in fps, thats where its at
saves you chasing shadows mate