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22 creedmoor brass volume

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akmtnhnt

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Has anyone actually measured the internal volume of their brass? Peterson, ADG and Alpha? Would be curious to see what the internal volume difference is between all of these if anyone has some and wouldn't mind measuring.
 
^^^ True for load development, but what if you're just trying to get some idea of which brass is thick and which brass is thin so that you can pick the most desirable brass for your goals?
Most ideal would be to fire-form each brand in your chamber, but assuming that you're not made of money and prefer not to buy brass that you ultimately won't use it would be nice to have some kind of relative data.
 
ntsqd said:
^^^ True for load development, but what if you're just trying to get some idea of which brass is thick and which brass is thin so that you can pick the most desirable brass for your goals?
Most ideal would be to fire-form each brand in your chamber, but assuming that you're not made of money and prefer not to buy brass that you ultimately won't use it would be nice to have some kind of relative data.
Click to expand...
Ya, this. If they sold 1 piece of brass and shipping was free, I'd go fire-form and measure. Lot's cheaper just to ask some people that very likely have the brass and have measured.

It would actually be really cool if there were a database of all kinds of cartridges and brands of brass and their unfired volumes.
 
akmtnhnt said:
It would actually be really cool if there were a database of all kinds of cartridges and brands of brass and their unfired volumes.
Click to expand...
Well, it would be cool because no machines tooling is identical and no manufacturer uses ONE drawing or forging machine.
Even the slugs that are punched can vary in weight and thickness.
Even though INTERNAL dimension is tried to be the same, different batches WILL vary, sometimes considerably.
However, Norma, Lapua and RWS brass is very, very good at consistency.
I measure ALL of my brass volume by CC's, do not believe weighing water is consistent, it may be relevant when comparing brands, but it is not accurate enough.

Cheers.
 
ntsqd said:
what if you're just trying to get some idea of which brass is thick and which brass is thin so that you can pick the most desirable brass for your goals?
Click to expand...
Then ask for thickness of it. But good luck finding someone to determine that for you.

Volume of new brass is an abstract, with every case measuring differently from each other.
And when volume has been set (by fire forming), it will be different with every chamber.
The best you could do is find someone using -same load -in same chamber -with these different brass brands.
That would be lucky
 
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Asking for the thickness may be more technically correct, but where? Since it varies within one case by where you measure it that would be a very difficult determination. Not to mention difficult for most to measure accurately.
By asking for the H2O case capacity I wouldn't care about the absolute numbers. How each brand of case varies in comparison to other brands of cases would tell me a fair amount about how they compare in case volume. The final determiner would be case volume after being fire-formed, but it would aid in choosing which case to start with. If two cases are close to the same capacity, then it is possible that they could which positions in the capacity list after fire-forming, but at least that list offers a starting point.
 
MagnumManiac said:
Well, it would be cool because no machines tooling is identical and no manufacturer uses ONE drawing or forging machine.
Even the slugs that are punched can vary in weight and thickness.
Even though INTERNAL dimension is tried to be the same, different batches WILL vary, sometimes considerably.
However, Norma, Lapua and RWS brass is very, very good at consistency.
I measure ALL of my brass volume by CC's, do not believe weighing water is consistent, it may be relevant when comparing brands, but it is not accurate enough.

Cheers.
Click to expand...
Interesting. We're talking some very small volumes/weights here. Just the meniscus would drastically change a volume measurement this small.
.1 grain of water is about .065ml. Good luck measuring that by volume.
 
akmtnhnt said:
Interesting. We're talking some very small volumes/weights here. Just the meniscus would drastically change a volume measurement this small.
.1 grain of water is about .065ml. Good luck measuring that by volume.
Click to expand...
Really, measuring in decimal places of CC's is far more accurate than grains of water…
Please measure a meniscus and get back to me….
 

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