Same with 17hmr, I bought a rifle in it, shot about 2 boxes of ammo before I realized I could reload better .223 for the same or less money, and that was like 8-10 years ago... LOL
I'm not so sure about that any more.
I've bought a bunch of 17hmr from stores for around $0.40/rd..
I also lucked out on the EE and got nearly 700 rounds of 17hmr for around $0.25/rd.
Even if I use the store rate of $0.40/round, I'd be pretty hard pressed to load a round of .223 for that (which I also do).
Primers now are approaching or surpassing $0.10/rd.
Varget, at say 25gr, is probably somewhere in the neighbourhood of $0.28/rd (can vary widely).
Even the cheapest bullets I can find, campro, are around $0.13/rd.
So right there I'm already at $0.51/rd for .223 using the cheapest bullets available and not accounting for my time or capital costs of the reloading equipment.
And besides all that, it is comparing apples to oranges. I have a 17hmr and a 556 and a 308 and 22lr, and a bunch of other calibers because why not have some fun and some variation?