When I was a youngster, 4831 was sold in gunshops at $0.75 per pound. Bring your own container. I used it for everything I owned at the time. .243, 6,5X55 and .308. The first powder other than 4831 I bought was when I picked up a .222 and got a can of BLC. I was amazed at the way it flowed through my powder measure and started looking for better powders for my other rifles.
Now days I have a bunch of different powders including Varget. Varget works great in the 6BR and .243 AI (with light bullets.) My .223 gets H322 or 8208. When I use 4831 in my bigger rifles, it's 4931 short cut.
Nothing wrong with having a bunch of powders around. Nothing wrong with having a bunch of different rifles around. A kid has to have more than one toy in the toy box.