Case capacity: .30 Carbine v. .327 Fed Mag

J

jski

New member
I searched the web hi and lo for the case capacity data on these 2 cartridges and got:

Wikipedia: 1.3640 cm3 (21.050 gr H2O)
Ammo Store: 0.92874 cm3 (14.3326 gr H2O)

Which are obviously at odds with one another.

For the .327 Fed Mag I got nothing, zero, the BIG goose egg.

Can anyone help?
 
Sources for the .327 Fed mag that I have found seem to mostly show net capacity after the bullet is seated, from 12.6 to 16.1 depending on bullet weight and seating depth. The weight for a 90 gr Sierra is shown as 13.4. However another source does show 19 gr which is probably gross capacity. A source for the .30 carbine shows 21 gr which is apparently gross and compares to the upper weight indicated by wikipedia. Perhaps the variation from 14.3 to 21.05 may be net compared to gross or some variation due to case brand.
 
case capacity information is hard to find. Even SAAMI doesn't appear to list it.

If you really desperately need it, and you're willing to do the tough math, you can take the measurements from any reliable source and work it out that way and get a very close approximation.
 
Per Quickload the overflow case capacity is:

30 Carbine 21.00 gr. H2O
327 Federal Mag 19.00 gr. H2O

For bottleneck cartridges, I find that QL values for case capacity are conservative as compared with what I actually measure.
 
Wikipedia is not a reliable source for accurate info about anything. Anybody with Internet access can post anything they want there. Away back the owners of it refused to form a panel of experts to check what was posted. One engineer actually quit over that.
However, case capacities don't mean much. Really only matters to ballistics engineers developing load data.
Anyway, the .327 is basically a proprietary cartridge that really answers an unasked question like most of the Federal cartridges. It's been around for 8 years, but nobody is playing with it. As in necking it up and down. Hence there's little data about it.
 
Wikipedia is not a reliable source for accurate info about anything. Anybody with Internet access can post anything they want there.
Click to expand...
When you learn to read the footnotes, they are as accurate as any other source on the internet.
 
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