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Advice Which Bisley Magnum For The Compatto?

Discussion in 'Anything Airgun Related' started by Simonsays, Mar 15, 2018.

  1. Simonsays

    Simonsays Donator

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    My Compatto has never liked Bis Mags (it shotguns them), but seems to prefer a diet o 4.51 HN FTTs. These perform ok, but I always suspect that there is something that should work better as the groups are unimpressive.

    It recently came back from Brocock with an accuracy report following some remedial work with a tidy group from Bis Mags. So it occurs to me that it just happens to be my particular tin/batch of BMs that could stop this barrel giving its best.

    Which sizes are others using please?

    I tried JSB 4.52s which could barely hit the target let alone any particular target. HN FTTs were tidy, BMs inconclusive - initially sh*te but improved to good with flyers.
     
  2. Mike.lewis

    Mike.lewis Donator

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    4.51 Bisley Magnums were ok when I had a compatto , Brocock recommended them after a few trips back to the factory.
     
  3. Simonsays

    Simonsays Donator

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    THanks Mike. Yes, that what I have. Sprays them like a shotgun; the FTTs are 4.51s I've two tins which work and a tin of 4.51 Kaisers which don't. But I should ask the question of Brocock.
     
  4. PW1

    PW1 Shooting the breeze.

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    My compatto target is pretty much perfect with AA Diablo Field 4.52

    Regards
    Peter
     
  5. Mike.lewis

    Mike.lewis Donator

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    The other thing to be aware of is I was told when Brocock test the gun they don't use the magazines so accuracy is better, none of the magazines I had lined up properly and everytime a pellet was loaded from mag to breach the pellets got damaged, you could see lead shavings in the breach area when mag was out.
    If you look at the magazine you might see the inner part that holds pellets doesn't line up with outer case of the mag
     
  6. Staffs86

    Staffs86 Engaging Member

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    My Compatto loves Bismags 4.52, H&N Baracuda match 4.52 and it’s especially enjoys Rangemaster Sovereign 8.44gn!
     
  7. metalman

    metalman Keyboard Hero

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    With the Bis Mags there is the 4.50, 4.51 and 4.52, and, yes they do make a difference . My R10 prefers the 4.52
     
    lone wolf likes this.
  8. lone wolf

    lone wolf Pro Poster

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    I could have posted that word for word!

    4.51 + 4.53 were all over but 4.52 are bob on!

    .
     
  9. Sky

    Sky Super Moderator Staff Member Mod/Admin

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    Same here - I've also seen others say the same. :)
     
  10. Simonsays

    Simonsays Donator

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    Brocock say that they use 4.52 or 4.53.

    I think that there is enough on here to justify trying some other sizes...
     
  11. Simonsays

    Simonsays Donator

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    Thank you. Yes I was aware of this but I’ve not experienced any significant improvement with single shot loading.
     
  12. PW1

    PW1 Shooting the breeze.

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    I have found no difference with single or magazine for accuracy.

    Regards
    Peter
     
  13. raven hunter

    raven hunter Posting Addict

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    I took the barrel off my steyr and using a rod pushed a JSB 4.53 down it, it was so tight, then 4.52 that was nice, shot 50 rounds though it ok at 30yds but 50 yds had a six inch circle so went down to 4.51, 50 yds groping the size of a 50 pence, 35 yds bull on bull, so brought a resizer of 4.51 now so not so much of a different make but getting the right size i think is best.
     
  14. Staffs86

    Staffs86 Engaging Member

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    I bought a Rowan Engineering single shot loader for my Compatto Target and I can definitely recommend it, I think it really makes a difference to the accuracy!
     
  15. SteV6

    SteV6 Member

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    Mine doesn't seem very keen on Bisley Magnums, though they're by no means the worst. Best thing I've found is AA Fields, which are really good (mine's 22 though, preferring 5.51).
    I tried quite a few different varieties, the worst being Superdomes which would get chewed up on loading and Accupels which would fall out of the mag without provocation. H&N FTTs refused to cooperate in a number of ways.
     
  16. Simonsays

    Simonsays Donator

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    AA Fields/JSBs are my go to pellet but the Compatto doesn’t like them. As it likes HN FTT it should accept the Bis Mags. Which is why I’m thinking wrong size...
     

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