Pellet say hello to Mr Transfer Port

Discussion in 'Walther' started by RobF, Feb 6, 2019.

  1. RobF

    RobF Administrator Staff Member

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    82E07C0F-DDDB-4F0D-AAED-91DB59BF6254.jpeg

    oh looks like they don’t get on...
     
  2. nemesis

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

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    That had better not be a mozzie yav butchered.:D
     
  3. RobF

    RobF Administrator Staff Member

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    Nah. That’s an express.

    But it occurred to me the less there are the more valuable they will become. :D
     
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  4. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    That must be a mighty big transfer port..;)
     
  5. hmangphilly

    hmangphilly Floppy Quick Phil

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    Std walther Colin ( 3,3mm )
     
  6. hmangphilly

    hmangphilly Floppy Quick Phil

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    Could the kind person who posted the picture of a hammerli leade and multiple tranfer ports .
    put it up again

    Ta
     
  7. SteveC200

    SteveC200 Active Member

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    [​IMG]


    :)
     
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  8. Dale

    Dale Active Member

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    Whilst the Pro-Target's slightly convoluted transfer port might affect the theoretical efficiency of the rifle, at least it doesn't cause damage to the pellet.

    I would take a small amount of wasted air any day over what is seen in Rob's picture.
     
  9. RobF

    RobF Administrator Staff Member

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    Couldn’t agree more Dale.

    Over the years we’ve been pondering the eternal what would be the ultimate 12 ft-lb pcp design and although the protarget is wasteful it avoids a lot of issues. Beyond the barrel solution I particularly like the breech closure which doesn’t impart any off axis force unlike most other rifles.
     
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  10. Dale

    Dale Active Member

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    Rob, my Pro-Target sports a 300mm cylinder and has the long export barrel fitted.

    Filled to 170 Bar I get 70 good shots out of it, ample to get round a course of fire with some to spare.

    I have to say that from my own point of view I have not felt the need to have a vastly higher shot count.

    Back when I was actively competing I would just top it up after going on the zeroing lane and prior to starting a match, never found any issue of inconvenience in doing it that way.

    To my mind I still think the Pro-Target was the best rifle AA made for FT (after the NJR100), sure it was an adapted 10m design but the cocking and loading system was excellent, the extended scope rail with in-built slope was good and its ease of maintenance was first rate and I liked the floated barrel, also the fact the action is totally ambidextrous with only the stock making the gun R/H or L/H.

    The only small area I could criticise in its use as a field rifle is the slot where the striker cocking lever runs, but that is about it, and to be honest it is smaller than the current ambidextrous slotting on a Steyr.

    I really don't think that the EV2 and now the FTP100 have been improvements on the overall design, in some ways they have been retrograde steps.
     
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  11. hmangphilly

    hmangphilly Floppy Quick Phil

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    Thanks Steve .
    Top man .


    I had this on a different make of gun recently too
    Hammerli looks like a workable solution without a full on re design
     
  12. hmangphilly

    hmangphilly Floppy Quick Phil

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    Well the fix we did yesterday seens to have worked .
    No pellets shaving bits off today , and shooting pretty predictably .

    It wasn't very tidy though so we've got a mark 2 idea planned ......

    new barrel with siamese ports ...........we made this pattern on a piece of offcut as a trial.......

    Big learning day today


    Thu Feb 07 21-15-18.jpg
     
    Last edited: Feb 7, 2019
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  13. hmangphilly

    hmangphilly Floppy Quick Phil

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    Hang about .

    News from the front line .

    His lordship's been testinging

    IMG_3872.JPG
     
  14. Conor

    Conor Never been banned from sales Staff Member

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    Not bad for 10m bench rested
     
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  15. hmangphilly

    hmangphilly Floppy Quick Phil

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    He said 107yd , blowing a hooly , trampolining on 1 leg , blindfolded . :)

    so gotta be pleased with that
     
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  16. C.Eaton

    C.Eaton Confirmed Anschutz Nut...

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    Just love a random, tumbling pellet, adds a bit of spice to target shooting...;)
     
  17. hmangphilly

    hmangphilly Floppy Quick Phil

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    Little update .

    The first fix on a std barrel seems to be working .

    Second go at a siamesed port is under testing now .
    We are thinking port volume / surface area is important .

    The 2 x 2mm holes choked the gun compared to the std 3.3mm ( might be 3.2 ......cant decide) std port .. The gun topped out at 800 /7.9s, which i was hoping was going to be a good thing , but it did seem to be quite heavy on air .

    Haven't abandoned this small port / choking thing yet but it's on a bit of a back burner.

    Initially enlarged the 2mm ports to 2.2mm, but still seemed a bit choked so we slotted the 2.2 s with a 2mm cutter by 0.75 mm. we now should have more port area than a std , and the power has gone up . and it seems a bit quieter and less harsh.
    The ports are now a kind of keyhole shape , but no pellet snagging so we'll go with that till the next time .

    We had to alter the probe to correspond with the slotted ports and following some puzzling erratic shot behaviour ( odd ) Rob noticed odd seating marks on a part pushed pellet . ...........good spot !

    we had run out of meat t the front of the probe tip and it was collapsing and not seating the pellet fully .
    New longer probe tip + 1mm ) now seats the pellet well and truly into the rifling and a quick few shots at 23.30 last night suggest we are back in business.

    work in progress .............

    No idea why we are flogging this old horse , but it's all goood fun .......and He likes the trigger ( not much else is std Ha ha ).
    It 's all good learning for the up coming Big Project ......top secret

    I want to sleeve the pellet tray to 5mm now and reduce the barrel entry . Got a bee in my bonnet about the size of the taper .

    I might even go the whole hog and bring the tranfer port into a longer tray and have a much plainer barrel .

    pics ......when i get it together ...........
     
  18. RobF

    RobF Administrator Staff Member

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    How about machining the tray as part of the barrel?
     
  19. hmangphilly

    hmangphilly Floppy Quick Phil

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    Hmm

    Makes machining the pellet leade a long way down the hole
     
  20. RobF

    RobF Administrator Staff Member

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    Yeh yeh... spoilsport :D

    Best make the fit tickety bo then...
     

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