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NitroXAdministrator
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.333 Jeffery?
      #368464 - 20/08/22 06:43 PM

What is the correct calibre of the .333 Jeffery?

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NitroXAdministrator
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Reged: 25/12/02
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.333 Jeffery? [Re: NitroX]
      #368465 - 20/08/22 06:48 PM

Per Woodleigh it is a true .333". Why is its naming so different to other or most British calibre naming?

Eg .318 WR, .404 Jeffery. .450 calibres, .400 calibres, .303 etc.

Does anyone here own a .333 Jeffery or rimmed, in a bolt action, doublebor single?

What are the ballistics?

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John aka NitroX

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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
"A Sharp spear needs no polish"

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wkudu
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Re: .333 Jeffery? [Re: NitroX]
      #368483 - 21/08/22 10:25 AM

The difference in naming is whether you are measuring the Bore diameter(from land to land) or Groove diameter (groove to groove). So for a standard 30 Cal the Bore is .300 and the Groove is .308. for 7mm its .275ish and .284ish. A .318 is the bore and .330 is what I think the Groove Diameter is for a .318 WR. Bullets match the groove diameter so the lands(rifling) grab on a force the bullet to rotate.

At least that's how I understand it. I'm sure smarter people will correct or add to it. It does seem the Brits are a little more inconsistent with naming. Especially with the brits liking to produce novel diameters for their branding. .375 is another named by groove diameter while Holland released the .275 H/H at the same time based off bore diameter. I guess to match the .375. Overall mostly by bore and that matches how they used to say "rigby's .275 bore" or such on barrels and ammo boxes. The differences in naming in America are mostly due to the multitude of same caliber cartridges we redundantly invent.

.333 Jeffery shots a 300gr bullet about the same speed a 318 shoots a 250 and then the .333 shoots a 250gr 2500+. Flanged is 50-100 fps slower than rimless.

And I want a .333 so bad. bolt and double. My dream medium bore

Edited by wkudu (21/08/22 10:32 AM)

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Huvius
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Re: .333 Jeffery? [Re: wkudu]
      #368484 - 21/08/22 01:02 PM

I had a 333 Jeffery for a while - detailed here on NE somewhere.
Unfortunately I let it go when I was getting out of bolt guns and into more singles and doubles.
It was an excellent rifle in a nice well used condition. One I should have kept I think.

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NitroXAdministrator
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Re: .333 Jeffery? [Re: Huvius]
      #368486 - 21/08/22 04:43 PM

I had an increasingly senior moment. Suddenly wondered what the .333 Jeffery actual calibre was??? i.e. with the often Brit nomenclature of using lands diameter not groove. Wondered why I didn't know it? Of course I did. As it is true .333". Duh.

Since looked up lots of NE threads with lots of previously known data.

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John aka NitroX

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Govt get out of our lives NOW!
"I love the smell of cordite in the morning."
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rigbymauser
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Re: .333 Jeffery? [Re: NitroX]
      #368497 - 21/08/22 07:40 PM

.333Jeffery vs 7x57 and 8x57

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