I'm getting ready to start reloading and have all my brass saved from the last thirty years. I have Federal Premium 30-06 brass with the old red boxes ca. 1980 and the gold/navy boxes. Likewise 7mm-08 with gold/navy and the current graphics. As my brass is from different lots and different eras, do you think that the brass will be similar enough to work out a load without the variety adding to the frustration factor. I intend to weigh a significant sample to see if there is much variation in that variable.