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Thread: .25 JSB King Heavy MK2

  1. #1
    Join Date
    Jul 2008
    Location
    Hethersett
    Posts
    334

    .25 JSB King Heavy MK2

    Hi all,

    Does anyone have any experience with .25 JSB King Heavy MK2 pellets shooting around 900fps? How are they grouping?

    Or any .25 boat tail slugs between 31g to 35g performance and availability?

    Also does anyone know anywhere in the UK they can be brought from?

    Cheers

    Geoff
    FX Maverick .22, FX Impact MK2 .30, PAX Phoenix MK2 Rifle .177, 410 SBS,
    CZ Brno 30-06, Dakota 76 African .416 Rigby, Rossi .38 special

  2. #2
    Join Date
    Apr 2016
    Location
    East Mids.
    Posts
    1,410
    I’m using them through my Impact, they won’t group at 900ftps i’ve wound it down to 830ftps and it’s grouping at 100yds indoors within a 20p coin!!!

  3. #3
    Join Date
    Nov 2004
    Location
    Near Reigate, Surrey
    Posts
    19,495
    They are fine but probably not quite as good as the 31 grain Baracudas. That being said 900 fps is too much for either. Experience with high power FAC .25 leads me to regard 50 ft lb as absolute tops. That means 850 fps with Baracuda. I've not run the JSB's that high but I'd be surprised if there was much in it. I know I bang on about air economy with FAC air rifles but to me there is just no point in wasting air.
    'It may be that your sole purpose in life is to serve as a warning to others'.

  4. #4
    Join Date
    Sep 2010
    Location
    Exeter
    Posts
    35,662
    I use the std King .25 25.4gn at 862fps / 42ftlb(ish), on a 42yd zero.

    I recently tried the heavy 33gn, it was doing 756ish fps, grouped well at that, but was 40mm low at the above zero, so I'm sticking with the 25gn.

    They're imported by AA & I think also by Daystate so anywhere that sell's either can get them, but as with most things .25 related few places stock them unless asked.

    Usually loads on the bay of e.

  5. #5
    Join Date
    Mar 2015
    Location
    Swindon
    Posts
    5,321
    Not at 900fps but, I've seen what a 33.3gn .25 JSB can do at around 825fps - it was an awesome set up and very accurate at 60yrds.

    But, I guess it's like any calibre and velocity - the rifle and pellet have to work together or you've got nothing.

    All of the above.

  6. #6
    Join Date
    Jul 2008
    Location
    Hethersett
    Posts
    334
    Thanks for the info guys. I will buy a tin of 33g JSB and some H&N then start punching paper.
    FX Maverick .22, FX Impact MK2 .30, PAX Phoenix MK2 Rifle .177, 410 SBS,
    CZ Brno 30-06, Dakota 76 African .416 Rigby, Rossi .38 special

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