Gosh guys, I have always heard this also. Also just for snickers and grins, just measured 100 peices of Remington 300RUM brass I just got in. I had a delta of wieght of 12 wopping grains. Measure a batch of Lupua 308 brass. Had 2.5 grains difference between 100 peices. I realize that the 300RUM wieghs almost 30% more than the 308's, but still 2.5grains is pretty uniform lot, wouldn't you say.