Thanks for the info. Might I ask where you got the info? I searched forever on the internet and couldn't find anything. I also looked in a number of books and magazines without any luck. Thanks again.
They're looking for the case capacity, in grains of water, for the Lazzeroni series of proprietary ultra-velocity (and very overbore) rifle cartridges. That gives you an idea of how many grains of powder the cartridges will accept, sans bullet displacement.
Similar powder-hopper overbore cartridges include the .300 Remington Ultra Mag and the big daddy, the .30-378 Weatherby Magnum.
For an idea on how much powder is needed to feed these monsters, remember that one pound of smokeless powder is equivalent to 7000 grains. If you load one of the Lazzeroni rounds light, say around 100 grains, you'll get a whopping 70 rounds per pound of powder.
Of course, the .50 BMG folks don't buy powder in single pound amounts. They're running on the order of 240 grains per round.
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