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300 Wby case volume

300 Wby case volume
« on: December 29, 2018, 06:33:37 PM »
I got looking thought some of my reloading stuff(the stuff that was stolen last winter), to see what I can use. I found 300 once fired 300 Wby brass, I forgot I had, various brands. So I was curious on how different the case volume's was, I see how much I would have to adjust my loads. So I took 5 cases of each brand, fill each one to the top with WC867 ball powder, and then weighed the powder in each case, then averaged the five of each brand. This is the results of the approx. case volumes:

Wby cases- 98.7 gr

Fed cases- 93.8 gr

Rem cases-94.8 gr

PMC cases- 99.3 gr

Nosler cases- 100.1 gr

That's approx. 6 gr's difference between them. For the new reloader's or for people thinking of getting into reloading, this is why 1) you always sort your brass by headstamp 2) always look on what brass they use for the data in reloading manuals 3) always start at the starting load in the manual, and work up slowly, watching for pressure signs. 

Rob
cfp-223REM
accumark-223Rem
ultralite-240 Wby
synthetic-240 Wby
synthetic-257 Wby
ultralite-270 Wby
fibermark-270 Wby
accumark-270 Wby
accumark-7mm Wby
stainless-300 Wby
fibermark-300Wby
accumark-30378 Wby
fibermark-340 Wby
accumark-338378 Wby
custom-375 Wby
DGR-378 Wby
DGR-416 Wby
custom DGR-460 Wby

Re: 300 Wby case volume
« Reply #1 on: December 29, 2018, 07:28:34 PM »
Rob that is some great info.I knew there were differences but not that much.
« Last Edit: December 29, 2018, 07:31:04 PM by terminator »
Roger
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Re: 300 Wby case volume
« Reply #2 on: December 30, 2018, 03:15:16 AM »
I've known about Federal brass having less volume for decades.It's always been that way and on any caliber you want to check.They make heavy brass.
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Re: 300 Wby case volume
« Reply #3 on: December 30, 2018, 05:17:08 AM »
6 grains, l knew they were different but never would have thought that much. Thanks for the information
Mike

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Re: 300 Wby case volume
« Reply #4 on: December 30, 2018, 09:20:19 AM »
My experience with Rem and Weatherby brass showed me the same. Started out loading Rem brass. The start charge for H1000 listed in multiple load data publishings (multiple sources) was compressed in Rem brass, and the mid charge pushed bullets out of the case due to the over compression. Pulled those and got some Weatherby brass, and everything is fine.
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Re: 300 Wby case volume
« Reply #5 on: December 30, 2018, 11:17:20 AM »
Just out of curiosity, did you trim all the cases to the same length? While that would never account for a 6 grain difference, it might narrow it down a little closer. The other thing that might be more accurate is to weigh the case empty and then fill it with water and weigh it again. That is more typical of the way case volume is determined rather than with powder. On the other hand, maybe your results are close enough to show the difference and that's all we really need to know. Thanks for taking the time to do this.
Weatherby Rifles:
M5 USA .257
M5 USA 6.5-300
M5 USA 300
M5 German 300
M5 .308 TRR
VG .308
VG 270
Other:
Win M70 30-06
Brn XBolt HC Speed 300 WSM
McMil G30 Dynasty 270 WSM
Ber B-14 HMR 6.5 CM
Mar 1895 SBL 45-70
Win 94 pre 64 30-30
4 AR-15 Match 5.56
2 AR-15 Match Wylde .223
1 AR-10 Match .308

Re: 300 Wby case volume
« Reply #6 on: December 30, 2018, 02:04:50 PM »
Just out of curiosity, did you trim all the cases to the same length? While that would never account for a 6 grain difference, it might narrow it down a little closer. The other thing that might be more accurate is to weigh the case empty and then fill it with water and weigh it again. That is more typical of the way case volume is determined rather than with powder. On the other hand, maybe your results are close enough to show the difference and that's all we really need to know. Thanks for taking the time to do this.

the point was to show, the difference, in case volume, that's why I said approx. case volumes. If I wanted to be real accurate, I would have took more than 5 cases of each brand, trimmed the cases to exact same length, and would have messed around with water. I know guys who have reloaded for years, and still don't sort their cases  :o 

Rob
cfp-223REM
accumark-223Rem
ultralite-240 Wby
synthetic-240 Wby
synthetic-257 Wby
ultralite-270 Wby
fibermark-270 Wby
accumark-270 Wby
accumark-7mm Wby
stainless-300 Wby
fibermark-300Wby
accumark-30378 Wby
fibermark-340 Wby
accumark-338378 Wby
custom-375 Wby
DGR-378 Wby
DGR-416 Wby
custom DGR-460 Wby