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I was told that if reloading Lake City brass that you need to reduce your load by 1 grain. Is this true? If so, is one grain enough when reloading .308? Is this because the case wall of the Lake City brass is thicker than say Winchester brass? Thanks!
 

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The case walls on military brass is thicker than commercial brass, therefore decreasing the usable volume inside the case. The same amound of powder in a smaller case will generate more pressure.
Reducing the amount of powder by a grain is not really neccesary, unless you are already at or near the max load. If you are near a max, or anywhere close, it is good to reduce your load for any changes, be it a change in cases, primers or whatever. Just to be safe. A hot load in a standard Win. or Rem. case may be over pressure in a military case.
 

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It would be important, when loading at "close to max," to know the signs of overpressure. I know a little about this, but I am sure there are others with much more experience than me who would elaborate on this subject.
 
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