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Old April 11, 2007, 12:11 PM   #1
Join Date: January 10, 2007
Location: Michigan
Posts: 99
.308 win vs 7.62x54r

I am looking through My Hornady Reloading manual (3rd edition) comparing the .308 win loads to the loads listed for the 7.62X54R and wondering if there is a simple reason why to takes 5.8 grains of powder to get the same results? Is the 308 more effecient for some reason?

What I am referring to is that listed loads for those cartridges using a 150 gr. spire bullet going 2800fps using IMR 4064 suggests 44.9 gr in the 308 and 49.1 in the 7.62X54R. I notice there are some differences in the case demensions and shoulder angle. Is the reason just the case configuration, all else being equal?
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Old April 12, 2007, 01:13 AM   #2
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 17,253
Case capacity

It has to do with the case capacity. The internal volume of the case. A larger case takes more powder to reach the same pressure as a smaller case.
All else being equal (and it almost never is) bigger bullets tend to work better.
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