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Thread: FWB 300S Energy level

  1. #1
    Join Date
    Sep 2013
    Location
    Newport
    Posts
    4

    FWB 300S Energy level

    Hi All,

    First post so be gentle...

    Just over a month or so ago I purchased a 44 year old FBW 300s to do 10m Target shooting at the club. I have been using a Walter LGV (new model) fitted with the 6ft/lb piston and it is really good but I wanted something a bit smoother.

    I have put it over the chronograph and obtained readings of between 512 to 531ft/s. I think it is a wee bit low and constancy seems off when compared to my LGV which is 595ft/s has a spread of 5 and St dev of 2.1.

    So my question is are the FBW 300s reading about right?

    Cheers.

  2. #2
    Join Date
    Jul 2007
    Location
    Ledbury
    Posts
    1,661
    Hi, it should be running about 640 fps if perfect but on the really older ones it tends to be around the 580 - 600 fps mark

    Charles

  3. #3
    Join Date
    Jan 2017
    Location
    Frederick
    Posts
    51
    Yup, probably springs or seals or a combination of both need replacing.
    If you are already aiming for the exact center of everything, then the target’s size shouldn’t matter — the center of a beach ball is just as big as the center of an aspirin tablet. -Byron Ferguson

  4. #4
    Join Date
    Sep 2013
    Location
    Newport
    Posts
    4
    Thanks for responding, I will order a service kit.

    Another question....The rear Sight will not adjust down. On inspection the threads on the adjustment screw are worn out, the block will move down against the springs so I guess both the block and screw need replacing. Any ideas on where I could obtain those parts?

  5. #5
    Join Date
    Jul 2004
    Location
    cardiff, south wales.
    Posts
    3,368
    Factory spec is 640 fps but that is with a 7 grain pellet. Both of mine make around 565 fps with 8.2 grain pellets, both serviced in the last 12 months with factory piston buffer, piston ring, breach seal, mainsprings & spacer. They are a 10m target rifle not designed for high power. You might find changing pellet may get you a little extra speed.

    John
    Law of any kind only affects those willing to abide by it.

  6. #6
    Join Date
    Sep 2013
    Location
    Newport
    Posts
    4
    Hi John,

    Thanks for the information. I tested it with R10 match which i think are 8.2gr so my results are just down from yours

    More of a concern is consistency. How good is yours?

  7. #7
    Join Date
    Nov 2012
    Location
    Norwich
    Posts
    1,049
    Mines running 6ftlbs with Falcon pellets.
    Thanks - Geoff.

  8. #8
    Join Date
    Feb 2017
    Location
    Ramsbottom
    Posts
    48
    Just tested my FWB 300s. 567-570 fps with R10 Match pellets @ 8.2gr.

  9. #9
    Join Date
    Jul 2004
    Location
    cardiff, south wales.
    Posts
    3,368
    The rear sight problem might just be a missing circlip, I wouldn't think they get used much once zeroed, even over 30 or 40 years.

    John
    Law of any kind only affects those willing to abide by it.

  10. #10
    Join Date
    Jun 2005
    Location
    Marlow, Bucks
    Posts
    7,051
    Quote Originally Posted by Tennyson View Post
    Thanks for responding, I will order a service kit.
    Please post a link to a service kit when you get one please....

  11. #11
    Join Date
    Jan 2017
    Location
    Frederick
    Posts
    51
    If you are already aiming for the exact center of everything, then the target’s size shouldn’t matter — the center of a beach ball is just as big as the center of an aspirin tablet. -Byron Ferguson

  12. #12
    Join Date
    Jun 2005
    Location
    Marlow, Bucks
    Posts
    7,051
    Thanks

  13. #13
    Join Date
    Sep 2013
    Location
    Newport
    Posts
    4

    The rear sight problem might just be a missing circlip, I wouldn't think they get used much once zeroed, even over 30 or 40 years.

    John



    Thanks John,

    Cannot see a circlip, should it be fitted on the threaded screw for the ups and down?

  14. #14
    Join Date
    Jul 2015
    Location
    Hastings
    Posts
    1,498
    Hello to All,

    +1 on Foest - I get all my FWB300 & 65 service kits from them.

    I also get stuff from 'Olympic Marksman Equipment' on Fleabay.

    Have fun & a good Sunday

    regards

    Russ

  15. #15
    Join Date
    Jul 2004
    Location
    cardiff, south wales.
    Posts
    3,368
    Quote Originally Posted by Tennyson View Post
    Hi John,

    Thanks for the information. I tested it with R10 match which i think are 8.2gr so my results are just down from yours

    More of a concern is consistency. How good is yours?
    Not brilliant, around 12 fps with RWS Meisterkugeln 8.2 grain (Is that how you spell it) . I'm going to try some 7 grain when my current stock run out.

    John
    Law of any kind only affects those willing to abide by it.

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