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  #21  
Old 03-23-2019, 10:23 PM
South Pender South Pender is offline
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Neither the 20 Nosler nor 22 Nosler were formed from the 404 Jeffery case. Both have a base diameter of ~.42" (so far less than the .545" of the Jeffery) and the rebated rim diameter of .378" to fit .223 bolt faces.

Here's pic of the 22 Nosler:

https://load-data.nosler.com/load-data/22-nosler/

Although very similar to each other, the 20 Nosler is not merely a 22 Nosler necked down. The parent case for the 20 Nosler appears to be the 6.8 SPC (or, alternatively, the 30 Remington), whereas no parent is given for the 22 Nosler.

This Wikipedia explanation covers the 22, 26, 28, 30, and 33 Nosler cartridges:

https://en.wikipedia.org/wiki/Nosler...ary_cartridges

From this, we can see that only the 26, 28, 30, and 33 Nosler cartridges were based on the 404 Jeffery case, and not the smaller two. In the Wikipedia article, we see that the base diameter of each of the larger four Nosler cartridges is .550--very close to the nominal .545" for the Jeffery. The four Nosler cartridges have a slightly rebated rim diameter of .534", slightly smaller than the nominal .543" for the Jeffery.
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  #22  
Old 03-23-2019, 10:32 PM
Bayou City Boy Bayou City Boy is offline
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Quote:
Originally Posted by South Pender View Post
Neither the 20 Nosler nor 22 Nosler were formed from the 404 Jeffery case. Both have a base diameter of ~.42" (so far less than the .545" of the Jeffery) and the rebated rim diameter of .378" to fit .223 bolt faces.

Here's pic of the 22 Nosler:

https://load-data.nosler.com/load-data/22-nosler/

Although very similar to each other, the 20 Nosler is not merely a 22 Nosler necked down. The parent case for the 20 Nosler appears to be the 6.8 SPC (or, alternatively, the 30 Remington), whereas no parent is given for the 22 Nosler.

This Wikipedia explanation covers the 22, 26, 28, 30, and 33 Nosler cartridges:

https://en.wikipedia.org/wiki/Nosler...ary_cartridges

From this, we can see that only the 26, 28, 30, and 33 Nosler cartridges were based on the 404 Jeffery case, and not the smaller two. In the Wikipedia article, we see that the base diameter of each of the larger four Nosler cartridges is .550--very close to the nominal .545" for the Jeffery. The four Nosler cartridges have a slightly rebated rim diameter of .534", slightly smaller than the nominal .543" for the Jeffery.

Your Wiki link is the same link from where I quoted part of the text in my post just before yours.

I guess we'll have to see what the final specs and dimensions of the commercial 20 Nosler cartridge will be when it is actually commercially produced. The text at the Wiki link very plainly states that there is no "parent cartridge" for the 22 Nosler cartridge that Nosler designed.

-BCB
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Last edited by Bayou City Boy; 03-23-2019 at 10:38 PM.
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  #23  
Old 03-23-2019, 10:37 PM
South Pender South Pender is offline
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Quote:
Originally Posted by Bayou City Boy View Post
Your Wiki link is the same link from where I quoted part of the text in my post just before yours.
I see that. I posted mine before seeing yours....
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  #24  
Old 03-23-2019, 10:38 PM
L.Sherm L.Sherm is offline
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The 6.8 SPC is not the parent case for the 20 Nosler.The 20 is 1.476 to the datum line, 1.618 to neck shoulder junction and 1.85 case length.
6.8 SPC is 1.295 to datum 1.41 to neck shoulder junction and case length is 1.69.
The 22 is in between the 2
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  #25  
Old 03-23-2019, 10:42 PM
Bayou City Boy Bayou City Boy is offline
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Quote:
Originally Posted by L.Sherm View Post
The 6.8 SPC is not the parent case for the 20 Nosler.The 20 is 1.476 to the datum line, 1.618 to neck shoulder junction and 1.85 case length.
6.8 SPC is 1.295 to datum 1.41 to neck shoulder junction and case length is 1.69.
The 22 is in between the 2

As previously stated, you are correct in that there is "no parent case" for the 22 Nosler, and likley none for the 20 Nosler either. If/when the 20 Nosler cartridge actually appears on dealer shelves, then we'll actually be able to determine its true dimensions from samples and from final published SAAMI specs. At this time, it appears that the 20 Nosler parent case will be the totally new 22 Nosler case, but time will tell.

-BCB
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Last edited by Bayou City Boy; 03-23-2019 at 10:47 PM.
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  #26  
Old 03-23-2019, 11:14 PM
South Pender South Pender is offline
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Quote:
Originally Posted by L.Sherm View Post
The 6.8 SPC is not the parent case for the 20 Nosler.The 20 is 1.476 to the datum line, 1.618 to neck shoulder junction and 1.85 case length.
6.8 SPC is 1.295 to datum 1.41 to neck shoulder junction and case length is 1.69.
The 22 is in between the 2
Good information. I have a couple of questions:

1. Isn't the datum line the distance between the base of the case and a point on the shoulder (i.e., between the beginning of the shoulder and the neck-shoulder junction)? From what I've seen, and if this is correct, the datum line for the 20 Nosler should be 1.535", whereas that for the 6.8 SPC would be 1.35"--different as you have pointed out. However, this brings up my second point:

2. How much DNA must a case and another share to consider one the "parent" of the other? Consider the 30-06 and .270 Win. Different datum lines and different overall lengths. Yet we normally consider the '06 as the parent of the .270. Is it necessary to use this familial metaphor that it must be possible to form the "offspring" from the "parent" via a simple pass of the parent through the offspring's die?

Edit: One other thing. I"m wondering why Nosler thought it necessary to create a completely new case for the 20, rather than simply necking down the 22 Nosler. Case capacity of the 20 Nosler must be almost identical to that of a .20/.22 Nosler.
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Last edited by South Pender; 03-23-2019 at 11:19 PM.
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  #27  
Old 03-23-2019, 11:40 PM
L.Sherm L.Sherm is offline
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Datum lines on 270 and 06 are almost identical .194, the biggest difference in the 2 is the 270 neck is about .040 longer. You could make 270 out of 06 but vice versa would be tough because of the neck difference.
I consider parent cases like 221 FB -20 VT, 404 Jeffrey's to the RUMs and 28-30 Noslers basically be able to make one case from the other. You cant make a 20 or 22 from a 6.8
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  #28  
Old 03-23-2019, 11:43 PM
L.Sherm L.Sherm is offline
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The 20 Nosler appears to have a little more case capacity the datum line is a little longer and case length is too. I'm betting Nosler designed the 20 longer so it wouldn't chamber in a 22 Nosler
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  #29  
Old 03-23-2019, 11:48 PM
Bill K Bill K is offline
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[ You cant make a 20 or 22 from a 6.8[/quote]

Shearm, is not the 224 Valkyrie a 6.8 necked down ? Bill K
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  #30  
Old 03-24-2019, 12:22 AM
L.Sherm L.Sherm is offline
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I'm not sure on that one Bill I've never compared cases.
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