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Normal Topic Peregrine .22 RF Problem (Read 407 times)
n.r.davis
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Peregrine .22 RF Problem
Jun 27th, 2025 at 1:14pm
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The numbers: .034 FP Protrusion.  .040 Rim Depth  Calfee Match Chamber.  Getting an imprint from the FP on the Rim Recess causing a Burr.  Yes I need to deepen, .043, the Rim but still by the numbers shouldn't' hit the Rim Face.  Only thought I have is with a very strong Main Spring the force is driving the Brass hard enough to impact the Rim Face.  It has an Inertia or Floating FP
and the photo of the strike to me says the FP sets back after striking.  Help is appreciated 🤔  David
  
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cellargun
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Re: Peregrine .22 RF Problem
Reply #1 - Jun 27th, 2025 at 5:41pm
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As the old saying goes, some disassembly required...
Pull the breechblock. With an inertial firing pin you need to check protrusion while pushing the FP as far forward as possible as it may be traveling more than you think. If it has a return spring, that spring may be compressing or coils distorting when struck with the hammer that allows too much travel.
  
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John Taylor
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Re: Peregrine .22 RF Problem
Reply #2 - Jun 27th, 2025 at 11:14pm
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Set the firing pin to protrude no more than .035". Brownells use to sell a tool for ironing out the dent.
  
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n.r.davis
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Re: Peregrine .22 RF Problem
Reply #3 - Jun 28th, 2025 at 3:11pm
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Not the Usual Suspects.
Measured 3 different ways and came up with .034 protrusion.
Did some Dry Firing testing out the Trigger before shooting.  Picture is of FP, FP Body with the Return Spring, and the Breach Block Bushing.  The FP was loose enough that I could remove it with my fingers.  So the Theory is Dry Firing would propel the Pin forward to strike the chamber.   Going to Solder the Pin in and probably make a One Piece Pin.  🤷🏻

  
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jhm
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Re: Peregrine .22 RF Problem
Reply #4 - Jun 28th, 2025 at 9:32pm
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There appears to be a slight burr where the firing pin strike is. Might want to run a reamer in the chamber and clean it up or at least deburr it.



JMH
  
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stevens52
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Re: Peregrine .22 RF Problem
Reply #5 - Jun 28th, 2025 at 10:05pm
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If the rifle has a match chamber I’d suggest you not use the brownells tool to iron out the dent. I know of at least one case where the result was a standard chamber.
  
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n.r.davis
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Re: Peregrine .22 RF Problem
Reply #6 - Jul 1st, 2025 at 12:11pm
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Made up a tool to iron out the dent out of Drill Rod.  Kept it simple, Chamber dia. with a Flat filed to clear the Burr and edge of the Flats backed off to ease the push.  David
  
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Andover Arms
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Re: Peregrine .22 RF Problem
Reply #7 - yesterday at 9:37am
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I'll start by saying I have no familiarity with a Peregrine, but if your measurements are correct (rim recess and FFP) then it would be impossible for the FP to leave that detent in the chamber rim recess. My initial though is that the FFP when fired with the hammer/mainspring vs measuring with the breech block out, is actually more than your measurement. It would be interesting to see a photo of the underside of the rim of the case you posted the picture of. Even so I don't think it would be likely that the FP would compress the brass rim, and the brass rim would indent the chamber. I mean no offense and I could be wrong, but it looks like the telltale signs of dry firing a few times with nothing in the chamber. Please post a picture of the underside of the case rim if/when you get a chance. Regards, Chris
  
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