Note the size of the canisters of Winchester Western gunpowder in the lower right corner of this 1978 ad! Handloaders in that era were serious about their hobby.
Also note the absence of coat-tail cartridges. The ones listed here are cornerstone calibers—those that led the way for the myriad numbers developed in the last two decades.
Note: Winchester Smokeless Propellants is now owned by Hodgdon. www.hodgdon.com