The Accurate Reloading Forums
500 A-Square and 505 Gibbs

This topic can be found at:
https://forums.accuratereloading.com/eve/forums/a/tpc/f/4711043/m/47010757

22 September 2002, 05:57
Mingbogo
500 A-Square and 505 Gibbs
Does anyone know what is the water capacity (overflow) for these two cartridges? To do an accurate measurement, I assume that the primer must be in place and then overflow the water and then dump the water out to weight it.

I tried to search the AR database but could not find anything as most old posts are gone now. I remember Mitch had some info about this a while back and I cannot find it now. Any info will be greatly appreciated. Thanks. Ming
22 September 2002, 06:31
Nickudu
CARTRIDGE CAPACITY IN GRAINS OF
WATER:

.50 BMG 270.0
600 Nitro 225.0
577 T.Rex. (German Cases) 225.4
577 T.Rex. (A-Squares Cases) 212.3
585 Nyati (Bertram Cases) 187.3 - 188
505 Gibbs 180.0
500 Jeffrey 160.0
500 A-Square (460 Wea.Cases) 144.0
460 Wby. 140.0
378 Wby. 137.0

[ 09-21-2002, 21:32: Message edited by: Nickudu ]
22 September 2002, 09:50
Mingbogo
Thanks Nickudu for the info. Do you happen to know what is the neck thickness of the 505 Gibbs? Based on my guesstimation, it is about .015 thick and it just seems a little too thick. Is this correct? Cheers! Ming
22 September 2002, 10:02
Nickudu
Both my Bertram & Horneber brass mic up at .0145" to .015" with a tubing micrometer. Funny, that's one of the few measurements that compared favorably between the two brands, as my particular run of Bertram .505 brass is clearly inferior, in this regard.
22 September 2002, 10:17
Mingbogo
Very good Nickudu. Based on the water capacity of the 505 Gibbs and the neck thickness info given by you, I am able to complete my virtual modeling of the cartridge. Now I am able to adjust the internal volume of the cartridge anyway I want, assuming that all the internal thicknesses are correct. Many thanks. Cheers! Ming
23 September 2002, 19:05
<Pablo>
[QUOTE]Originally posted by ming:
[QB]Does anyone know what is the water capacity (overflow) for these two cartridges? To do an accurate measurement, I assume that the primer must be in place and then overflow the water and then dump the water out to weight it.

Nic,
I just weighed the case dry, fill with water, and reweigh, I got 142.5 grs h2o in 500 A-Square, using norma 460 weatherby brass
24 September 2002, 00:43
Nickudu
Hi Pablo,
Welcome to our Forum! [Smile]

142.5 grains? That sounds close enough for government work. So many variable in this. It may even be due to differences in water chemistry.