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case capacity, gr water???

 
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Old 12-29-2013, 02:20 AM
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case capacity, gr water???

So like a nerd I am examining all my reloading manuals and came accross something unusual. The nosler 7 guide calls out gr. water for every load. They use the same case but this measurement varies significantly. At first I assumed it was due to seating depth. But it isn't consistent with this theory. Does anyone have any insight? The nosler book is really nice how it's detailed and calls out specifics. The only thing it leaves out is which bullet the loads are based off of. Bearing surface being what comes to mind regarding this area.
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Old 12-29-2013, 08:52 AM
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Re: case capacity, gr water???

Quote:
Originally Posted by upacreek View Post
So like a nerd I am examining all my reloading manuals and came accross something unusual. The nosler 7 guide calls out gr. water for every load. They use the same case but this measurement varies significantly. At first I assumed it was due to seating depth. But it isn't consistent with this theory. Does anyone have any insight? The nosler book is really nice how it's detailed and calls out specifics. The only thing it leaves out is which bullet the loads are based off of. Bearing surface being what comes to mind regarding this area.
I'm not sure this explanation is right in terms of what you are referring to in the Nosler manual which I haven't seen, but I use water to evaluate the caacity differences between my brass cases, and loads. When I develop a load that I consider to be optimum, I will fill the prepared(trimmed and sized) case with the primer hole plugged, fill it completely with water, and weigh the case. I then subtract the empty case weight to get an exact capacity of the case. Since load performance can vary based on case capacity, this gives me a reference point should I change to a different lot, or brand of brass. It will also give an indication of case capacity differences between new, neck sized, or FL sized cases. This may be the difference the water capacity of the loads shown in the Nosler manual. Due to the component shortage I picked up some Norma 300WM to back up my supply of Winchester brand cases. The difference in case capacity between the two brands was 2.3gr, the Norma having greater capacity. Actual performance was different. The capacity between 260 Norma and Lapua brass was within .5gr, and performance was identical in terms of accuracy and velocity. This was an easy switch except for a having to use a smaller neck bushing with the Norma brass.
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Old 12-29-2013, 10:38 AM
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Re: case capacity, gr water???

In the manual there is around 3gr difference with the same brass mfgr (it is specified) for the same caliber. The 7wsm has like 5 bullet weights. Each weight has the primer and brass called out. But the water gr. varies in my mind quite a bit. Just thought it was weird. Nosler is more detailed than my other books, but this kind of inconsistency makes me wonder if it's not fluff to look detailed. Maybe someone could shed some more light on the subject.
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Old 12-29-2013, 06:18 PM
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Re: case capacity, gr water???

Probably volume occupied or changed by different seated bullets, to same COAL.
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Old 12-29-2013, 09:43 PM
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Re: case capacity, gr water???

That was my first thought, but not likely.

7WSM 120gr.........76.8gr water
140gr........74.5gr water
150gr.........73.5gr water
160gr.........74.3gr water
175gr.........72.1gr water

7RM. 120gr.........81.4gr water
140gr..........77.8gr water
150gr.........78.0gr water
160gr.........80.4gr water
175gr........77.0gr water

300WM 125gr.........85.8gr water
150gr.........81.7gr water
165gr........81.1gr water
180gr........82.3gr water
190gr........81.2gr water
200gr........77.4gr water
220gr........79.6gr water

My suspicion is there is no logical answere. Maybe a typo.The 7WSM used Winchester brass, but the others call out nosler brass.
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Old 12-29-2013, 10:12 PM
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Re: case capacity, gr water???

It's a screwy system there and I wouldn't credit it as useful.
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Old 12-30-2013, 06:07 AM
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Re: case capacity, gr water???

Quote, "They use the same case but this measurement varies significantly." End quote

These aren't the same case, they are completely different calibers and therefore will have different case capacity.
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