View Single Post
Old September 6, 2012, 02:34 AM   #1
NWPilgrim
Senior Member
 
Join Date: September 29, 2008
Location: Oregon
Posts: 2,340
Are LC cases really less volume in .30-06?

Every reloading manual warns for .30-06 and .308 that military cases such as LC brass hold less volume than commercial brass, and there for be loaded with 1-2 gr less powder.

I don't see this when I weigh cases of various head stamps. My brass is sorted by headstamp and within LC by decade as well. Not by lots.

Winchester and WCC is lightest at 186 gr avg.
All LC brass weigh 193-194 gr avg.
Remington is 195 gr avg.
Federal is 198 gr avg.

All of the brass is FL sized and trimmed to 2.475". I would think that given the same external dimension through sizing and trimming that the lighter cases would have more interior volume and the heaviest ones the least. According to this logic the Winchester cases should have the most volume and the FC and R-P the least volume, with the military LC cases being in the middle. Am I missing some other factor or is that military brass warning incorrect?

The LC brass us from the 1950s-1970s, and the commercial brass is from the 1990-2005.

BTW, I find the same thing true in 5.56x45/.223. FC cases are much heavier than LC, R-P is slightly heavier to LC and Winchester is the lightest.
NWPilgrim is offline  
 
Page generated in 0.03791 seconds with 8 queries