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Thread: Lapua brass

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  1. 06-05-2015, 02:56 PM #26
    7mmsaum
    7mmsaum is offline
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    Quote Originally Posted by stug View Post
    That was my understanding as well.

    Has anyone actually taken the time to get two different pieces of brass that weigh 2 grains different and then measured the volume of each to see what the difference actually is?
    Brass has a density of 8.73grams/cm3. 2 grains is 0.1295978 grams, so 2 grain difference is 0.0148cm3 difference in volume.
    According to wikipedia the 308 has a case volume of 3.64mls which is 3.64cm3. So one will have a volume of 3.6400cm3 and the other will have a volume of 3.6548cm3. Enough volume difference to make a pressure difference? Who knows.
    You lost me at 308
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