Firing Pin Fall

Discussion in 'Advanced Gunsmithing & Engineering' started by NV_Dmax, May 13, 2019.

  1. NV_Dmax

    NV_Dmax Gold $$ Contributor

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    hello,
    I have a new Panda Fclass with a Bix and Andy 2 stage benchrest trigger and I’m getting intermittent hang fires and several rounds failure to fire this last time out. I have been unable to get this rifle to shoot (first barrel was a 6.5 Swede IMP and now it’s a straight .284 Win) and the ES and SDs are horrible, worse than the shittiest factory ammo available with both barrels/chamberings so I’m gong to start looking at the ignition system.

    My question is does anybody know what the optimal firing pin fall should be for a Panda Fclass?
     
  2. BIG D

    BIG D

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    .240 is the place to be. My first panda did the exact same thing. I even changed the spring a couple times. Then I measured pin fall and was only just over .200 so I called kelblys and got the correct trigger hanger.
     
  3. Stingray

    Stingray

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    Call Kelbly's = had the same problem when I rebarreled and had to get a different hanger. Measure pin fall and give them a call. Mine works now. I had all kinds of advise before getting my gunsmith to diagnose the problem.
     
  4. NV_Dmax

    NV_Dmax Gold $$ Contributor

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    *update*

    I called Kelblys and they are sending a new hanger. Pin fall was .203”. They recommended .250” so they’re sending out a .050 hanger. I had this exact same issue with one of the early versions of the Curtis Custom Axiom actions so at least I had an idea of where to start.
     
    swd likes this.
  5. Tim Singleton

    Tim Singleton Silver $$ Contributor

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  6. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    Pandas start to have accuracy issues below around .230. .240-.250 is where most actions should be for best accuracy.
     
  7. Ledd Slinger

    Ledd Slinger Gold $$ Contributor

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    Definitely get that pin fall up higher, but when you mention hang fires, it makes me think you also might want to look at trying a different lot of primers if you havent already.

    A while back I purchased 500 pieces of Lapua 6mm Creedmoor SRP brass from a member on here. Said he couldnt get his rifle to shoot no matter what he tried. 200 of the cases were once fired, and 300 were brand new with Federal 205 primers in them. I thought this was great because I usually load my SRP rifles with Federal 205 primers, sometimes Fed 205 Match.

    When I finally got around to load development using the primed brass, I was getting a decent amount of fast hang fires where I could definitely hear the strike a split second before the Boom, and even had a few FTFs. I made sure my pin fall was over .240" when I built the rifle (.243" to be exact) so I knew that wasnt the issue. I deprimed the rest of the cases that still had the previous owners Fed 205s and primed them with my own known good lot of Fed 205s. Problem solved. Rifle shoots very well now.
     
    Last edited: May 15, 2019
  8. Tim Singleton

    Tim Singleton Silver $$ Contributor

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    Bullet central carries an adjustable hanger that works great
     
  9. NV_Dmax

    NV_Dmax Gold $$ Contributor

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    Thanks for the responses everyone. I have one already and the adjustable hanger from Bullet Central still doesn’t get me where I need to be. I would have to modify it to work and there wouldn’t be enough meat left on the front tabs that the screw tightens up against to hold the hanger in place.

    I have 5k new Federal GMM210m on the way, that definitely crossed my mind. Didn’t have the hangfires when I tested CCI but the ES and groups where completely unacceptable.
     
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  10. Dusty Stevens

    Dusty Stevens COVFEFE- Thread Derail Crew Gold $$ Contributor

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    Primers are not the issue here- lets dont drive off into the grass. You really need to send that bolt to kelblys to get it corrected and go back to the original trigger hanger
     
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  11. Stumpy1

    Stumpy1 Gold $$ Contributor

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    Question for the experts;

    When you talk about pin fall, are you talking about total fall as the firing pin goes through its full travel, OR pin fall as it would make first contact with the primer (essentially no protrusion)?

    Thanks much! (trying to learn here)

    Frank
     
  12. Alex Wheeler

    Alex Wheeler Gold $$ Contributor

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    Dry fire pin fall.
     
  13. Tim Singleton

    Tim Singleton Silver $$ Contributor

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    Yea
    May want to let Kelbys or a knowledgeable gunsmith checkb it out in general
    Not sure how many hands it's been thru before you
    Someone may have recut the cocking piece. Sounds like it anyway
     

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