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JWL
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Breech Seating 38-55
Mar 12th, 2020 at 2:01pm
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I am getting some lead, flakes only, in my 38-55 Hepburn. Did a cerosafe cast and as clos3 as I can determine the diameter across the lands is .3801 and .3795 in the grooves. I have tried two bullits so far. 1- .381 tapering to .377  2- .380 tapering to .379. Seating so that the base is marked all the way to the base. Your thoughts on this?
  
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bluesman
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Re: Breech Seating 38-55
Reply #1 - Mar 13th, 2020 at 12:38am
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Might need to go up a thousandth or even two in diameter at the base, gas blowby can make a mess.
  
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bnice
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Re: Breech Seating 38-55
Reply #2 - Mar 13th, 2020 at 8:42am
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Is the throat cut for breach seat? If not are the flakes possible from shearing? Just a thought?
  
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OLD TUCK
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Re: Breech Seating 38-55
Reply #3 - Mar 13th, 2020 at 2:04pm
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I used to use 30/1 Lead/Tin alloy in my rifles. Shot well and never a problem with Leading, BUT! every time I shot I would give the Rifle a wipe with Hoppy on a Patch. The first patch thru would have very small Fines of lead on the patch. Not heavy mind you but very small shiny specs. So I tried an alloy of 25/1 and they disappeared and still shot just as well so 25/1 became my alloy. HTH Regards.
FITZ. OLD TUCK Smiley
  
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JWL
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Re: Breech Seating 38-55
Reply #4 - Mar 13th, 2020 at 4:28pm
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I am new to this stuff and I didn’t know that the throat had to be cut for breech seating. I will try a harder allow as I have been casting 30-1. 
What I am seeing when cleaning is flakes not streaks.
  
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rkba2nd
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Re: Breech Seating 38-55
Reply #5 - Mar 13th, 2020 at 6:07pm
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There is nothing that says you have to throat a barrel for breach seating, just usually works out better doing so. But there is a lot more to it than just cutting any throat. If you decide to pursue it, have it done by someone familiar with the process.
  
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oneatatime
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Re: Breech Seating 38-55
Reply #6 - Mar 13th, 2020 at 7:25pm
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Hey Joe, that 5 land 4 groove barrel must have been cut by Escher;-)
  
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Quarter_Bore
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Re: Breech Seating 38-55
Reply #7 - Mar 14th, 2020 at 2:37pm
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All .38-55 Hepburns I have shot needed .382 to .384 bullets to shoot well.
  
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