Pellet pushing

Discussion in 'General Airgun Chat' started by hmangphilly, Feb 28, 2018.

  1. hmangphilly

    hmangphilly Floppy Quick Phil

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    The more I think about this, the more , there seems to be in it .

    We had another barrel last night that went from ok to really quite good after seating the pellet a little bit further in .

    There's s bit of a pattern emerging .
    I think that's 3 or 4 now .

    Whether my leads are a bit baggy I don't know . But these are all what I would call quite steep . 10 ish degrees .

    I've got a plan to test . I'll just chop a bit off and see what happens .
     
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  2. Rich3344

    Rich3344 Member

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    Are the pellets going from just sitting in the lead-in to fully formed into the rifling, or just slightly different positions fully engaged in the rifling?

    If it's the latter, it must be to do with the volume of air behind the pellet?

    If it's the former, maybe sudden engagement with the rifling causes an issue?
     
  3. hmangphilly

    hmangphilly Floppy Quick Phil

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    I don't think they are going as far as 'fully engaged ' Rich .

    I think where the skirt is just starting to snug into the rifling is about the point .
    I'll shorten the plain section of leade a bit and see if that has the same effect . It worked on Monty's .

    I need to take a bit of deflection out of my leade tool too
     
  4. Rich3344

    Rich3344 Member

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    What are you using to cut the lead-in? I guess you can either turn it with a boring bar or cut it with a chamfer cutter/ countersink?

    I wonder if a grinding operation would make a better job?

    A very gradual, long lead in might be interesting to try too, if you're knee deep in spare barrels and you haven't got frostbite yet....
     
  5. Monty

    Monty Senior Moment

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    Lopping a bit off the end and taking the shoulder on the barrel back a bit so the barrel made contact with the pellet tray (thus allowing the probe to push the pellet about 0.5mm further in) took pellets that wouldn't hit a paella pan to the grouping I posted in the group thread. Don't know exactly how much I took off the barrel though, Phil let me turn it and I did it by eye to get it close to where the lands started to rise with a bit of space for a light 45 deg chamfer. Nothing else changed so must be to do with the pellet being snugger, the probe was always right up the skirt so no change in the delivery of air.

    I don't think he was entirely in agreement with the 'doing it by eye' bit :eek::rolleyes:
     
  6. hmangphilly

    hmangphilly Floppy Quick Phil

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    Whatever works mate .

    If it is right , it usually looks right ................but not necessarily vice versa ...................ooh that's a bit deep .................off to me shed .........
     
  7. hmangphilly

    hmangphilly Floppy Quick Phil

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    Yeah ,
    i think the plan was to start with the 10 degree then go to a shallow taper , but the F.O.P s interrupted that .
     
  8. RobF

    RobF Administrator Staff Member

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    ....
     
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  9. Monty

    Monty Senior Moment

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    Dirty boy :eek::)
     
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  10. hmangphilly

    hmangphilly Floppy Quick Phil

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    "Sir . ...Sir ..... Farnworth's doing the rude stuff again ."
     
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  11. hmangphilly

    hmangphilly Floppy Quick Phil

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    Re-visiting this , after a year on a back burner ...

    It has been discussed in

    LG110 accuracy around page 13 if the link don't go straight there
     
    Last edited: Mar 6, 2019
  12. hmangphilly

    hmangphilly Floppy Quick Phil

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    Currently trying this

    I get to keep the stabiliser too

    C827971B-87B4-4534-9159-E8F79A95C10F.jpg D54F9BC9-B985-477A-B959-42790074E31D.jpg 3BE55584-BBF4-4322-81EA-20084D4EBDFD.jpg 446D323A-9D43-4711-A9B4-227E266D3DAF.jpg 518D25FB-C282-4C3A-A964-E0425D0E4DB0.jpg
     
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  13. johnnyboy

    johnnyboy Active Member

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    Now that's interesting Phil.....testing next.
     
  14. Nick G

    Nick G Active Member

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    Not as far as accuracy is concerned, but when I set up my springers so the trans port pushes the pellet flush with the end of the barrel( ie engaged with the rifling, & the skirt sealing) They consistently make more power .
     
  15. hmangphilly

    hmangphilly Floppy Quick Phil

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    yes mate
    testing now
    sized pellets seem to be going well

    Don't ask me what size . Home made sizer from yonks ago . I'm wondering if it actually matters so long as they re all the same .
     
  16. hmangphilly

    hmangphilly Floppy Quick Phil

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    We found that too Nick . ( with springers ) .
    We think it helps to create a 'pop' pressure . Certainly lost oodles of power when I got all creative and tried to apply a shallow pcp leade to a tx . Despite having no light visible around the skirt .
    We think the pellet just started moving too early to build up efficient peak pressure

    Pcps seem to like the pellet fully engaged . We are still on shallow smoothe leade .

    I'll be doing a few of these little devices .
    If a few Steyr users want to have a go at testing . I'll say 10 to start with if that's ok
    Foc

    My barrels have a shorter leade than a std , so I'll need to know what you have .
     
    Last edited: Mar 7, 2019
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  17. nemesis

    nemesis 55yrd standing expert, or was it 8 or 9?

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    Much better than super glueing a ball bearing on end of ya thumb
     
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  18. hmangphilly

    hmangphilly Floppy Quick Phil

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    Well you're getting one sent over for a start
     
  19. nemesis

    nemesis 55yrd standing expert, or was it 8 or 9?

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    Cheers pal, have you noticed if it restric's the velocity necessitating turning it up a bit.
     
  20. hmangphilly

    hmangphilly Floppy Quick Phil

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    I didn't notice Neil .
    I had the gun to bits any way , checking the hammer and re hardening the sear .

    It makes power with a reg at 84s, but i have not counted the shot count yet.

    I cant keep the 4mm port size, the wall will be a bit thin for the plastic
     

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