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condorsc
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Unknown chambering
Dec 2nd, 2024 at 12:35am
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I have a RB target rifle I would much appreciate a reasonably accurate guess on the chambering. The barrel is new, eight lands and grooves. The chamber cast shows a case that is pretty close to a 38-40, but the bore is smaller than the app. .40 caliber of the 38-40. The eight lands and grooves are app. .349 and .356. Of course, much smaller than 38-40. Comments?
  
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jimmy
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Re: Unknown chambering
Reply #1 - Dec 2nd, 2024 at 11:34am
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357 Bain Davis or a 44 mag necked down to 38?
  
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Cat_Whisperer
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Re: Unknown chambering
Reply #2 - Dec 2nd, 2024 at 11:40am
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condorsc wrote on Dec 2nd, 2024 at 12:35am:
I have a RB target rifle I would much appreciate a reasonably accurate guess on the chambering. The barrel is new, eight lands and grooves. The chamber cast shows a case that is pretty close to a 38-40, but the bore is smaller than the app. .40 caliber of the 38-40. The eight lands and grooves are app. .349 and .356. Of course, much smaller than 38-40. Comments?


dimensions from the chamber cast would be helpful.
  
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marlinguy
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Re: Unknown chambering
Reply #3 - Dec 2nd, 2024 at 2:08pm
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Have you measured the rim diameter at least? Maybe a .38 Long or .38 Extra Long?
  
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condorsc
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Re: Unknown chambering
Reply #4 - Dec 6th, 2024 at 2:11pm
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Cat_Whisperer wrote on Dec 2nd, 2024 at 11:40am:
[quote author=6B6D6D6F0E323F346B6D62695A0 link=1733117731/0#0 date=1733117731]I have a RB target rifle I would much appreciate a reasonably accurate guess on the chambering. The barrel is new, eight lands and grooves. The chamber cast shows a case that is pretty close to a 38-40, but the bore is smaller than the app. .40 caliber of the 38-40. The eight lands and grooves are app. .349 and .356. Of course, much smaller than 38-40. Comments?


dimensions from the chamber cast would be helpful.[/q

Case OAL           .165

Mid- shoulder     .424.

Rim                  .535

Neck                .393

Break(Beginning of shoulder) .460

Headspace app. 1.32

Bbl. 26-1/4"







  
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