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Brocock Compatto Inaccuracy

Discussion in 'Technical' started by russellnoon, Jun 28, 2020.

  1. russellnoon

    russellnoon Active Member

    Messages:
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    Hi
    I wonder if anybody could help my friend has just purchased a second hand Brocock Compatto .22 mk1. The problem is, it is shooting all over the place even with it having a clean. It feels very crunchie when loading the pellet which to me doesn't feel right. I came up with an idea to fire the pellets into a bucket of water to retrieve them to see if the pellets are being scarred in any way. On inspection of the pellets they are being marked all the way round on the dome and the skirt, to me surely this isn't normal I have attached a picture has any body come across this on the compatto's before and know what it could be, if it's pellet size etc
    Regards
    Russ [​IMG]

    .
     
  2. paulairgun

    paulairgun Keyboard Hero

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    Location:
    Bedworth nr Coventry
    Hi mate. I had one that was the same. You could feel the pellet crushing up when the probe was pushed into the breech. Bought a new mag incase the original was faulty and it was the same. Almost like the mag wasn't totally lined up with the barrel. Single loading it was fine and it was very accurate. Its on my list of sold guns now and put me off brocock TBH
     
  3. russellnoon

    russellnoon Active Member

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    Yes it doesn't feel nice at all does it. The pellets look like they have bite marks all the way round them which is obviously coming from the barrel. It's like the pellets need resizing. My friend isn't happy at all he has only just got it last week
    Regards
    Russ

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  4. robs5230

    robs5230 You don't need a sledgehammer, to crack a nut

    Messages:
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    Location:
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    Those marks are rifling marks from the barrel.

    However a looser fitting pellet may feel better on loading.

    Using a single shot tray rather than the magazine should improve things further
     
    silverfox1307 and russellnoon like this.
  5. sovell

    sovell Well-Known Member

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    As robs5230 says, rifling marks on pellets.
    I find with mine, seating pellets deeper into mag helps.
    Also longer pellets may cycle better, try single shot tray to check accuracy.
     
    russellnoon likes this.
  6. russellnoon

    russellnoon Active Member

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    He is ordering lots of sample pellets and hopefully he will get it sorted
    Regards
    Russ

    .
     
  7. Simonsays

    Simonsays Donator

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    That’s heavy rifling. Try a harder pellet such as H&N FTT or Bisley magnums.

    I’m sure Big Al would say it needs a barrel polish.

    I’d say some Compattos are just shotguns. Mine was replaced 3 times before getting one that worked as advertised. Good ones are great but they do seem to make a lot late on a Friday afternoon.
     
  8. Mike.lewis

    Mike.lewis Very Active

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    It's probably a faulty magazine, the one I had was crap if I used the mag but fine if I used a single shot tray.
    The inner part of the mag doesn't quite line up with the outer part- which caused the pellets to be damaged as the probe pushed them from the mag.
    Have a look at the breach area after firing a few mags and you will probably see little bits of lead all over it.
     
  9. Meal Dot

    Meal Dot Posting Addict

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    You can 'tune' the mags within reason to rectify some misalignment. First check by looking at the mag from the front side and see if the rotating part holes line up with the fixed part hole when cycled. If not, slacken the two allen screws at the rear. Adjust so holes line up accurately and retighten the allen screws. Might not line up first try so keep doing until lineup corresponds nicely. My Compatto cycles nice and clean and is accurate. HTH
     
    russellnoon likes this.
  10. russellnoon

    russellnoon Active Member

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    I will mention this to him aswell

    .
     
  11. russellnoon

    russellnoon Active Member

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    What calibre do you have.

    .
     
  12. silverfox1307

    silverfox1307 Busy Member

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    When I first got my Compatto Mk1 I tried all sorts of pellet brands and many of them made the cocking action craunchy but JSB Jumbo 5.52’s were the best if the bunch, I then sent for some JSB samples with different head sizes and found that the 5.50’s were much better and with excellent accuracy, I don’t use anything else now.
     
  13. 32:1

    32:1 Theoben user

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    I had the same with Bantam, mags were poor even replacement new ones, it shot far better single loading and I found a pellet it shot best 4.50 hnftt giving 40yd groups of 100mm, barrel was problematic and I had crown removed and breach relieved. Yes it helped a lot dropping that group to around 40mm, happy that was the best it could perform I sold it quickly and tried forgetting all about the poxy thing

    Chris
     
    Simonsays and talent like this.

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