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LJP
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Yet another cast projectile diameter question
Aug 14th, 2020 at 9:47pm
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I have an original Remington Hepburn No3 .40 1-7/8. A chamber cast was cerrosafe proved it to be chambered in .40-60 Winchester. I now have dies / brass & finally got round to slugging the bore diameter today. Slugged it twice & came back with 0.4075". Measuring the throat on the chamber cast measures 0.415". Was thinking .410" should be best for the throat / bore combination I have. Question is what diameter projectile should I be shooting? Was going to purchase some ready cast projectiles to start with until I'm set up to do my own. Any advice would be greatly appreciated.
  
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ndnchf
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Re: Yet another cast projectile diameter question
Reply #1 - Aug 15th, 2020 at 10:24am
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You didn't mention the groove diameter. That is another piece of the puzzle. That bore diameter sounds more like groove diameter. Is it the same as the throat?
  
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Bnelson
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Re: Yet another cast projectile diameter question
Reply #2 - Aug 15th, 2020 at 11:11am
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The 40 1 7/8 is the designation for the 40-50 straight.  Maybe that is the difference you are seeing.
Bruce
  
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LJP
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Re: Yet another cast projectile diameter question
Reply #3 - Aug 15th, 2020 at 7:47pm
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I think Im getting my terminology wrong. The OD of the slug measured .4075". The grooves are smaller - actually very faint I'm struggling to get consistent measurements.
  
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