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Brudford01
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Breech Seating and case length ?
Jan 10th, 2015 at 5:41pm
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I plan on always breech seating 32-40 in my CPA rifle .Will the cases ever stretch and need trimmed like all my other rifle brass? Why I ask is that for reasons of economics I have always used a Lee case length gauge and chucked the cutter head in my drill press, works fast and accurate , however I see that Lee Precision does not make a case length gauge for the 32-40 WCF . Thanks
  
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bohemianway
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Re: Breech Seating and case length ?
Reply #1 - Jan 10th, 2015 at 5:46pm
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I have never had to trim especially when using 30-30 brass (fireformed). With BS case length, as long as it is short enough, isn't an issue. MTCW
  
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rkaires
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Re: Breech Seating and case length ?
Reply #2 - Jan 10th, 2015 at 5:50pm
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I never had to trim cases for my CPA in .32-20CPA and .40-50SS.
  
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gunlaker
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Re: Breech Seating and case length ?
Reply #3 - Jan 10th, 2015 at 5:53pm
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I have had cases stretch when I tried Goex FFFg Express in my .32/40.   When using FFg or Fg they stretched about 0.040" and then stopped stretching.  I now have some brass with 250+ firings on them. They've never been trimmed or annealed.

Chris.
  
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JLouis
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Re: Breech Seating and case length ?
Reply #4 - Jan 10th, 2015 at 6:31pm
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I have found the need to trim 32-40 cases when breach seating. Its also not un-typical to have one side of neck stretch more than the other. Only takes a minute to check the length on occasion, the ones that stretch more on one side than the other stick out like sore thumb.
  
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gunlaker
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Re: Breech Seating and case length ?
Reply #5 - Jan 11th, 2015 at 11:58am
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John, do you anneal your cases?  I have had uneven case mouths, but only when I was shooting freshly annealed cases.  I stopped my annealing experiment after that. 

The non-annealed cases seem fine for me, but it could simply be that I haven't been doing this for nearly as long as you and have yet to run into the problem.

EDIT:  I should also add that I have stretched a number of Starline .38-55 cases.  Maybe because they are significantly thinner at the mouth than Win .32-40 brass?  (My Starline is only .007" to 0.008" at the case mouth.)

Thanks,

Chris.
« Last Edit: Jan 11th, 2015 at 12:04pm by gunlaker »  
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mb3240
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Re: Breech Seating and case length ?
Reply #6 - Jan 11th, 2015 at 12:11pm
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Does the type of powder you use (fast vs slow) effect stretching?
  
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JLouis
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Re: Breech Seating and case length ?
Reply #7 - Jan 11th, 2015 at 12:25pm
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Chris I do not anneal.

MB32-40 I don't know what you would consider a fast and slow powder to be?
  
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gunlaker
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Re: Breech Seating and case length ?
Reply #8 - Jan 11th, 2015 at 4:45pm
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Thank you John.

Chris.
  
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