Loosing FPS

[jn316]

Finally received new pellets RWS Meistkugeln 22. 14gr and ran a ten round string.
These are the results:
Ave.=646.9
Hi =   649.5
Lo =   644.2
Es =    5.3
Sd =    2.3
Ad =    1.9
3/8s to 1/2 groups  @ 15yds
Not bad right?
I just wanted to say thanks again for all of your help and advice on this rifle   

[Bladebum]

Finally received new pellets RWS Meistkugeln 22. 14gr and ran a ten round string.
These are the results:
Ave.=646.9
Hi =   649.5
Lo =   644.2
Es =    5.3
Sd =    2.3
Ad =    1.9
3/8s to 1/2 groups  @ 15yds
Not bad right?
I just wanted to say thanks again for all of your help and advice on this rifle   

Yes those numbers are much more like it with a 14 grain pellet. Depending on your elevation you could probably squeeze some more out of it but honestly I would leave it alone. Accuracy and consistency are what matters and your definitely doing that!

[clarky]

I have found such seals last much longer by introducing a minimum of lube, or in some cases no lube at all.
Provided a hint of STP or Krytox is added to the seal to aid assembly, the seal needs no more and anything further merely adds to detonation issues that we are seeing above.
A hint of moly is all that is required on the opposite end of the piston.
From here we can then select the best pellets to reduce slam to a minimum.

As an interesting side note, i have come across numerous guns which just do not seal properly at the breech, giving rise to slam and piston seal damage. Feinwerkbau Sports were notorious for slight barrel opening at the breech at the moment of firing. It was barely a few Thou and not noticeable but due to a weaker lock up design would just take pressure off the O ring breech seal for a micro second and cause the problems.
I noticed that guns with good heavy lock ups and using a single wrap of Floss behind the O ring gave zero gas loss and longer lasting piston heads, provided lube was kept down.
Interesting post guys.

[Dennis22]

I have found such seals last much longer by introducing a minimum of lube, or in some cases no lube at all.
Provided a hint of STP or Krytox is added to the seal to aid assembly, the seal needs no more and anything further merely adds to detonation issues that we are seeing above.
A hint of moly is all that is required on the opposite end of the piston.
From here we can then select the best pellets to reduce slam to a minimum.

As an interesting side note, i have come across numerous guns which just do not seal properly at the breech, giving rise to slam and piston seal damage. Feinwerkbau Sports were notorious for slight barrel opening at the breech at the moment of firing. It was barely a few Thou and not noticeable but due to a weaker lock up design would just take pressure off the O ring breech seal for a micro second and cause the problems.
I noticed that guns with good heavy lock ups and using a single wrap of Floss behind the O ring gave zero gas loss and longer lasting piston heads, provided lube was kept down.
Interesting post guys.

I have a FWB124 and it is blowing air out of the breach, I have installed a new O ring.  How are you applying the dental floss?

Thanks
Dennis

[clarky]

Just cut a piece off 1/2 inch to 3/4 inch long and lay it in the bottom of the groove and replace the O ring on top ....
The detent was a bit weak on these after a full year of use.

[OleTomCat]

New breach seals are $3.49 from ARH...

https://www.airrifleheadquarters.com/page/page/251483.htm

I have found such seals last much longer by introducing a minimum of lube, or in some cases no lube at all.
Provided a hint of STP or Krytox is added to the seal to aid assembly, the seal needs no more and anything further merely adds to detonation issues that we are seeing above.
A hint of moly is all that is required on the opposite end of the piston.
From here we can then select the best pellets to reduce slam to a minimum.

As an interesting side note, i have come across numerous guns which just do not seal properly at the breech, giving rise to slam and piston seal damage. Feinwerkbau Sports were notorious for slight barrel opening at the breech at the moment of firing. It was barely a few Thou and not noticeable but due to a weaker lock up design would just take pressure off the O ring breech seal for a micro second and cause the problems.
I noticed that guns with good heavy lock ups and using a single wrap of Floss behind the O ring gave zero gas loss and longer lasting piston heads, provided lube was kept down.
Interesting post guys.

I have a FWB124 and it is blowing air out of the breach, I have installed a new O ring.  How are you applying the dental floss?

Thanks
Dennis

[clarky]

The Seals made by Tony Leach and the Aussie Red seal seem indestructable.
Failing those, i have had leather seals last since the 80s if treated right...