Just getting started and was wondering if the older manuals were worth buying? Working on building up my library and ordered the new lyman manual but I've got bits on ebay for some manuals from the 80's and 90's. Do the loads change over the years or has the recipe for the powders change? I've read that the loads have become more conservative over the years and some of the old loads were pretty hot. Were the load manuals from the 60's and 70's to hot and when did they start making them milder?