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Cat_Whisperer
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32 mould diameter ?
Oct 23rd, 2015 at 8:27am
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Have a CPA 32-40 bbl that is .3135 - .3215 diameters.

This suggests .322 -.323 diameter mould, yes?

  
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marlinguy
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Re: 32 mould diameter ?
Reply #1 - Oct 23rd, 2015 at 9:30am
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Seems like a large variance in diameter of the bore? Is this a choked barrel, or what? .3135" is tiny for a .32-40, and hope that doesn't create issues with a bullet sized to fit the larger diameter of .3215"? 
I would agree on the.322"-.323" diameter mold, just not sure how it will work with the minimum size of your CPA bore.
  
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Cat_Whisperer
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No 1, 9.3x74R

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Re: 32 mould diameter ?
Reply #2 - Oct 23rd, 2015 at 10:17am
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groove diameter, bore diameter 

puts groove depth (.3215 - .3135 = .008 then divide by 2 = .004")  to normal depth.
  
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.22-5-40
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Re: 32 mould diameter ?
Reply #3 - Oct 23rd, 2015 at 11:40am
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I like to go at least .001" over groove for smokeless.  You didn't say if B.S. or fixed..but your .322-.323 should work with either.  In my .38-55 with it's .379 groove dia., I can only use up to .380" in fixed because of chamber dimensions.
  
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marlinguy
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Re: 32 mould diameter ?
Reply #4 - Oct 23rd, 2015 at 12:20pm
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Thanks for the clarification! That makes much more sense than that much variation in a CPA barrel.
  
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Cat_Whisperer
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Re: 32 mould diameter ?
Reply #5 - Oct 23rd, 2015 at 1:36pm
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Yes, with Paul's name on it, it lives up to my expectations of highest quality.  Smooooooth running a patch (or a 00 buck shot) from breech to muzzle.

Have not flipped the coin on fixed or breech seating.

I guess I need to do a chamber cast too.

(00 buck may work for squirrels....)
  
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Re: 32 mould diameter ?
Reply #6 - Oct 23rd, 2015 at 8:54pm
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No, .3215 suggests .3215 to .322. Preferably .3215

     Joe. 

  
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Cat_Whisperer
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Re: 32 mould diameter ?
Reply #7 - Oct 23rd, 2015 at 10:40pm
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westerner wrote on Oct 23rd, 2015 at 8:54pm:
No, .3215 suggests .3215 to .322. Preferably .3215

     Joe. 



SO, if it casts .3225 would you size it down a smidge?
  
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