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Thread: I don't believe a TP smaller than 3.0mm ever works in a 12FP springer....

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  1. 18-04-2021, 07:54 PM #1
    look no hands's Avatar
    look no hands
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    Quote Originally Posted by harvey_s View Post
    No mention of calibre...does it not influence the optimum size of TP required?
    Sorry .22 with a 10" barrel.

    Pete
    Far too many rifles to list now, all mainly British but the odd pesky foreigner has snuck in
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  2. 18-04-2021, 09:37 PM #2
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    Get yourself a cheap pin vice and hammer a long steel rod up the back end. Make sure you wrap the widest part in tape so it doesn't scratch the inside of the cylinder.
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  3. 18-04-2021, 10:25 PM #3
    brucegill
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    Been out of the game for a long time now and can’t find any of my old notes on 77k with a 25mm piston. What’s the best starting place for these? 3.6mm springs to mind but I don’t trust my memory lol. .22 if that maters...
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  4. 19-04-2021, 05:11 AM #4
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    Quote Originally Posted by brucegill View Post
    Been out of the game for a long time now and can’t find any of my old notes on 77k with a 25mm piston. What’s the best starting place for these? 3.6mm springs to mind but I don’t trust my memory lol. .22 if that maters...
    holy revival - bruce is back from the dead - long time mate, how are you ?

    Start with 3.4 and test
    Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
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  5. 19-04-2021, 09:28 AM #5
    brucegill
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    Quote Originally Posted by Shed tuner View Post
    holy revival - bruce is back from the dead - long time mate, how are you ?

    Start with 3.4 and test
    thanks Jon, nice to be back 3.4mm it is.....
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  6. 31-07-2021, 10:34 AM #6
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    I know nothing about this subject as my following question will indicate

    I'm assuming the transfer port is directly behind the pellet, so why aren't the ports the same size as the pellet calibre?
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  7. 31-07-2021, 12:10 PM #7
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    Quote Originally Posted by Garry View Post
    I know nothing about this subject as my following question will indicate

    I'm assuming the transfer port is directly behind the pellet, so why aren't the ports the same size as the pellet calibre?
    'cos that'll be too big
    Interestingly the old pre-wat BSA underlevers were made like this, as the loading tap was reamed through. They benefit massively from being sleaved down to 3mm or so - more power, less harsh..

    Another practical reason is to stop your pellets falling back into the cylinder through them
    Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
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  8. 19-04-2021, 12:13 AM #8
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    Quote Originally Posted by look no hands View Post
    Sorry .22 with a 10" barrel.

    Pete
    I wasn't referring to your post specifically just the OP's theory in general.
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  9. 19-04-2021, 05:06 AM #9
    look no hands's Avatar
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    Quote Originally Posted by harvey_s View Post
    I wasn't referring to your post specifically just the OP's theory in general.
    Oops!

    And there's me thinking you cared

    Pete
    Far too many rifles to list now, all mainly British but the odd pesky foreigner has snuck in
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