I started in 1952 when in gunsmith school. It was more or less expected. In fact when you bought a reamer set back then a sizer was pretty much automatically included for you to make your own dies. One of my first rifles was a 6.5x54MS which was not loaded in the US. The reamer set from Raton Reamers had a sizer I used to make a set of dies for it. I have been loading ever since. I looked in my reloading area and I have 20 sets of dies for everything from 257 Roberts to 416 Rigby, 450-400 3 1/4 though I no longer shoot very much.