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Thread: 22 Spitfire/5.7 Johnson

  1. #41
    Boolit Master
    Join Date
    Feb 2006
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    Kaneohe, HI
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    2,311
    I think I've found the best load for this rifle.
    11.5 of 2400. 40g Sierra .223 bullets
    1 1/2 at 50yds. No soot.
    Started at 10.5 and worked up to 12.0.
    11.5 and 12.0 no difference.
    I'll load more rounds and move to 100yd accuracy.
    Getting closer.
    Be off this Sunday. Sister in town.

  2. #42
    Boolit Master
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    Mar 2005
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    Hodgenville, KY-Lincolns Birthplace
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    FWIW
    Manual of Catridge Conversions pg 709
    40gr/spire/14.0gr-2400 /2850fps/Nonte
    50gr/spire/14.0gr-IMR4198/2700fps/Barnes

  3. #43
    Boolit Master
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    Feb 2006
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    Kaneohe, HI
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    In my earlier testing I did try some 14.0gr loads.
    Little to hot. to me

  4. #44
    Boolit Master

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    Each gun is a different story for sure but good advice to start low as we know. Sure looks like 2400 is going to be hard to beat. Any of those powders around that burn rate would be worth a look see.

    Any info on primers used?

    This is a pretty good bunch of information on a cartridge about which there really isn't much info written on. Great work guys!

  5. #45
    Banned
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    san antonio, tx
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    Newtire,

    Fwiw, when I was "way down South", one of the Civil Guard guys had a US .30 M1 Carbine converted to the .22 Johnson Spitfire & used it for hunting both 2-footed & 4-footed quarry.

    I cannot remember either sort of "game" getting away after being hit with that little carbine.

    BEST WISHES, tex

  6. #46
    Boolit Master
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    Feb 2006
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    Kaneohe, HI
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    I've been having problems with the gas piston.
    The nut keeps blowing off.
    I've cleaned the threads in the housing. They look good.
    Noticed a crack where the hole on top is.
    Don't see any other cracks in it.
    Last time I added some blue Loctite, but it didn't help.
    I ordered a new nut and will try that.

  7. #47
    Boolit Master

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    Yeah, the nut was cracked on my .30 cal. when I bought it. I think that if it gets loose, it hammers a bit and cracks. Put a touch of blue loctite on it. Just warm it up with your propane torch for about 3-4 seconds when you want to take it out. It won't crack or come loose anymore I'll bet.

  8. #48
    Boolit Master


    Join Date
    Apr 2009
    Location
    iowa
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    Quote Originally Posted by abunaitoo View Post
    I've been having problems with the gas piston.
    The nut keeps blowing off.
    I've cleaned the threads in the housing. They look good.
    Noticed a crack where the hole on top is.
    Don't see any other cracks in it.
    Last time I added some blue Loctite, but it didn't help.
    I ordered a new nut and will try that.
    Do you happen to know the MFG who made the barrel, there were several barrel makers, if you can't figure out who and can take a pic or 2 maybe we can help you out.

  9. #49
    Boolit Master
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    Feb 2006
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    No marking anywhere on the barrel.
    The top front of the receiver is stamped....
    Plainfield Machine
    Dunellen. N.J.
    Cal.22 PMC M-5

    When I first started working on it, it had problems sometimes ejecting.
    It also sometimes had lots of blow back and blown shells.
    I noticed something rattling. When I took it apart, the piston was broken.
    Used the old nut with a new piston, and it's been blowing the nut out since.
    Last time I used blue Loctite and made it a little extra tight.
    Ordered a new nut.
    If the new nut doesn't work, I'll just spot weld it.
    If there is a big, long crack, I don't see it.
    Can't do anymore damage to it, and it should get it working again.
    Unless someone knows how to repair the threads in the housing.

  10. #50
    Boolit Master

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    Numrich has new barrels if worse comes to worse. https://www.gunpartscorp.com/products/766960A

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check