I was once given about 180 pieces of 6mm Remington brass. All was headstamped "R-P." When I began to evaluate it I could see that it all came from at least three different eras, based on subtle differences in the font or style of the headstamp. As it turned out, there was variation of about 20 grains between the average weight of each type. I'd call that considerable.
Yikes! That’s a lot. I’ve only had one occasion where a lot of Remington ‘06 brass varied drastically (~10 gr. heavier) from the norm. I’ve used Remington brass in 243 Win., 257 Roberts, 270 Win., 308 Win. & 35 Whelen and found them all to be nicely consistent. Naturally, average weight would occasionally vary by 3 or 4 grains between lots but that’s no big deal.
