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Case capacity .308 Win vs Norma brass

 
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  #1  
Old 02-06-2012, 07:00 PM
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Join Date: Oct 2011
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Case capacity .308 Win vs Norma brass

Hi there,

Was wondering if anyone had experience changing from Win to Norma brass in .308. I roughly came up with about 1.2gns less capacity in the Norma using powder as a measure.

How does this translate to reduction in charge? I was running 45gns Varget behind a 178 Amax in the Win brass but have started working up from 43gns in the Norma. I also had my barrel shorted slightly so my velocity figures aren't a reliable guide.

Any rough ideas would be greatly appreciated!

Matt
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  #2  
Old 02-06-2012, 07:13 PM
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Location: Outback, Australia
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Re: Case capacity .308 Win vs Norma brass

I can't help but I'd be checking for consistancy. Pick the brand with the most uniform vol..

When changing components always work up again. There are no safe short cuts I'm afraid.
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Old 02-07-2012, 07:38 PM
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Join Date: Aug 2003
Location: NC, oceanfront
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Re: Case capacity .308 Win vs Norma brass

How did you compare capacity with Win to Norma?
Were both case brands fully fireformed to your chamber?

You'll have to work up a new load for a brass change.
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Old 02-07-2012, 08:51 PM
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Join Date: Oct 2011
Posts: 38
Re: Case capacity .308 Win vs Norma brass

I just used varget powder. Both cases at least once fired. I understand water would be a better gauge, just powder was quick and easy. I am in the process of working up a new load, was just wondering if anyone had made the same change.

With one of my 30-30 loads, a case capacity difference of 0.5gn worked out to require a 0.3gn change in charge weight.

Matt
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