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procedure for measuring case volume

 
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  #8  
Old 04-01-2012, 08:04 PM
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Re: procedure for measuring case volume

BartB,

On your recommendation then, I may well do both methods ...at least this time around.

Worst case may be that I've wasted some time tinkering.

Best case may be that I eliminate a few fliers?

thanks!
richard
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Old 04-01-2012, 09:48 PM
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Re: procedure for measuring case volume

Quote:
Originally Posted by rscott5028 View Post
Best case may be that I eliminate a few fliers?
Most fliers are caused by the shooter. In second place, the cause is unbalanced bullets; sometimes new ones are that way and other times they're mangled by reloading tools and processes.
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Old 04-01-2012, 11:11 PM
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Re: procedure for measuring case volume

I agree and disagree so far..
For H20 capacity the cases need to be fully prepped to uniformity, and fully fireformed(unsized).
I also put just a few drops of alcohol in a cup of water to reduce meniscus at the mouths.
I don't clean cases to squeaky clean or anything.
I stand a deprimed case on a plastic golf tee inserted into the flashole on a scale. Zero the scale, then eyedrop water in to fill to the mouth. If needed, I touch a tissue corner to flatten water. Record the weight, update QuickLoad file.
It is a good idea to go slow at this.

You can find cases that are not playing with the others, and you can also see clearly that case weight itself does not directly correlate to volume.
Initial confinement plays a big role in powder burn and where and how peak pressure occurs. Believe, don't believe it, but be sure to see it across a good chronograph.
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Old 04-02-2012, 07:00 AM
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Re: procedure for measuring case volume

Quote:
Originally Posted by Mikecr View Post
For H20 capacity the cases need to be fully prepped to uniformity, and fully fireformed(unsized).
How does one fully prep their cases to uniformity?

They still won't all have the same outside dimensions even after firing them in the same chamber.

Quote:
Initial confinement plays a big role in powder burn and where and how peak pressure occurs. Believe, don't believe it, but be sure to see it across a good chronograph.
I don't believe you'll get the same results with each case over several firings. Have you repeated your tests at least 3 times with the same batch of cases and got the same answers each time for each case?

Proof of a test being a good one is every time its run, the same answer is obtained.
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  #12  
Old 04-02-2012, 08:46 AM
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Re: procedure for measuring case volume

It may be increasingly difficult to spot outliers after the first culling with these small/efficient cases.

My expectation is that after the initial culling, the brass will behave consistently with consistent treatment.

But, I'll certainly keep it in mind and monitor.

Thanks!
Richard
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  #13  
Old 04-02-2012, 11:51 AM
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Re: procedure for measuring case volume

Quote:
Originally Posted by rscott5028 View Post
Do you add alcahol or detergent to the water? I've seen references to "a little". But, I'm not sure what "a little" is? Or, what specific detergent?

For clarity, I don't care what the actual volume is. I'm interested in culling brass to form a consistent lot for competition.

Is it worthwhile to seat spent primers upside down?

thanks!
-- richard
I never have, but if I were to do that I would add "Photoflow." A drop of Photoflow is more than enough. I just leave the spent primer in the case. I never gave all this a lot of thought. But I did have a buddy that actually made some nylon plugs, but that was a lot of work for little gain in my book.

You can buy Photoflow at most camera shops, and a pint will last a very long time! (less than $10). It makes water seem like it it's wetter and also makes it spread out better on a surface. I use it to help me clean vinyl records, and it really helps.
gary
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  #14  
Old 04-02-2012, 12:05 PM
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Re: procedure for measuring case volume

Quote:
Originally Posted by rscott5028 View Post
I have 300 pieces of once fired 6br Lapua brass. And, I want to find the most uniform 50 for a competition.

I figured I would go ahead and check volume and see how much variance there is. If they vary a lot as a percentage of case volume, then it may be useful. If they don't vary so much, then it might be worth a quick check just to cull a couple of questionable cases.

I also plan on sorting bullets by bearing surface length and a few other things above and beyond what I would do for a long range hunting load.

Either way... If I've wasted my time, I'll know soon enough.

Thanks!
Richard
many years back I ran a test on brass to see if it had different weights for a specific cubic inch of size. I found it varied all over the place (was not being measured for reloading). If you used only one brand and lot, I think you'd be OK by case weights. But most of us don't. I ran this by a well known metalugical engineer, and he laughed at me (I always thought I was pretty good at metalurgy, but he was a lightyear ahead of me). He said everybody had their on make up of the alloy, and thus the weight per a certain volume would vary from brand to brand.
gary
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