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  #1  
Old 01-11-2022, 04:01 PM
barretcreek barretcreek is offline
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Default Fireball case question

Has anyone compared volume/weight of factory Fireball cases (.17 or .22) to cases formed from 5.56 brass?
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Old 01-12-2022, 11:18 AM
Hog Patrol Hog Patrol is offline
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Have not but a data point, the Nosler brass has less capacity than the factory R-P Remington brand. I use VV133 and it's almost a neck full difference.
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Old 01-12-2022, 11:51 AM
L.Sherm L.Sherm is offline
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If your interested i could weigh one of my 20VT cases reformed from 223 LC09 brass.
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Old 01-12-2022, 02:32 PM
foxhunter foxhunter is offline
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factory 221 fb 80.20, formed from lc 223 82.30
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Old 01-12-2022, 09:32 PM
Johnly Johnly is offline
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Norma 221 cases weigh 77.1 g and Lapua weigh 82.2 g

John

Last edited by Johnly; 01-13-2022 at 07:08 PM.
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  #6  
Old 01-12-2022, 11:25 PM
B23 B23 is offline
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Just weighed 25 pieces of new Lapua 221FB brass and it ranged from 81-82gr with the vast majority weighing 81.1-81.2
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  #7  
Old 01-13-2022, 01:59 PM
Oso Polaris Oso Polaris is offline
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Due to the higher pressure of military rounds, 5.56 cases have a thicker web, which would mean that a .223 case would have greater case capacity. By extension factory 221 Fireball brass would have more case capacity.

That said, there can be considerable variation in 5.56 case specs from different manufacturers and even the same manufacturer from one year to the next. The wall thickness and the case head/webbing thickness vary a lot. Also, the variation in OAL of case (trim length) may impact the case weight. You really need weight of cases empty and weight of case full to do apple to apple determination of volume.

Is there a specific headstamp that you are interested in comparing to factory 221 Fireball?
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Old 01-13-2022, 03:28 PM
Bill K Bill K is offline
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Osa. If the web is thicker, which we know it is, would that not mean there would be less capacity, instead of more ?
I don't bother to weigh cases, but just sort them by lot and then load each by what the pressure nodes show me and for accuracy first.
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Old 01-13-2022, 03:49 PM
barretcreek barretcreek is offline
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Is there a specific headstamp that you are interested in comparing to factory 221 Fireball?[/quote]

Good point on headstamps. No, just thinking in such as small case it gets more critical. Given the situation on brass I am inclined to start with a batch of 5.56 and form my own rather than look for factory. Todd's books are waiting up at the POB and as I dither on what flavor the M7 will end up I gather the bits'n'pieces to make a bunch of brass.
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  #10  
Old 01-14-2022, 04:22 AM
Oso Polaris Oso Polaris is offline
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Quote:
Originally Posted by Bill K View Post
Osa. If the web is thicker, which we know it is, would that not mean there would be less capacity, instead of more ?
I don't bother to weigh cases, but just sort them by lot and then load each by what the pressure nodes show me and for accuracy first.
As a rule of thumb "Yes", However, there are enough "irregularities" in which the case web thickness of different headstamps vary even though the cases are military 5.56...I have seen some cross-sections where .223 web was thicker than a 5.56 case web. Case wall thickness, extractor rim thickness, and even case length differences can account for the weight differences.

That's all I was getting at... might be some other factors in play.
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