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Normal Topic Best groove dia. for .321 32-40 (Read 771 times)
rraffl
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Best groove dia. for .321 32-40
Jul 12th, 2018 at 11:19am
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I'd like to have a 32-40 rifle that I can shoot with store bought .321 cast bullets (fixed ammo). Can I shoot this size bullet in a .319 or .320 barrel? I assume a .321 barrel would be ideal.

Thanks for your help.

Dick Raffl
  
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beltfed
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Re: Best groove dia. for .321 32-40
Reply #1 - Jul 12th, 2018 at 12:42pm
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I would be Happy to shoot 0.321" bullets ( fixed) in a
0.319 or 0.320 grooved barrel.
General rule of thumb is to use bullets 0.001+ larger than
groove diameter
beltfed/arnie
  
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J Louis
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Re: Best groove dia. for .321 32-40
Reply #2 - Jul 12th, 2018 at 2:53pm
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If wanting to shoot factory fixed while also knowing that earlier rifles were closer to 8MM groove diameters of .323 you might want to first check what the bullet diameter of the off the shelf fixed ammunition is that you might be planning to buy.

JLouis
  
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rraffl
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Re: Best groove dia. for .321 32-40
Reply #3 - Jul 12th, 2018 at 9:51pm
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The bullets I have found are usually sized from .321 to .323. I have never found a .320 or .319.
  
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J Louis
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Re: Best groove dia. for .321 32-40
Reply #4 - Jul 12th, 2018 at 10:23pm
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It sounds like you might not have purchased a rifle quite yet so if it were me I would try to find a rifle with a groove diameter that would best fit the current off the shelf bullet diameters that would continue to be readily available for your long term intended use.

JLouis
  
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rr2241tx
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Re: Best groove dia. for .321 32-40
Reply #5 - Jul 16th, 2018 at 1:38pm
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I have Meister and Oregon Trail bullets labeled for 32-40 and both measure .322 which works with .321 barrels. Neither is any good at all in a .323 barrel.
  
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ireload2
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Re: Best groove dia. for .321 32-40
Reply #6 - Jul 21st, 2018 at 2:56pm
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You might ask around about store bought bullets.
Most are very hard. I find softer bullets work better.
  
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