I've always considered the .225 Winchester one of those rounds that makes you scratch your head and say..."why??"
despite being the "velocity king" the .220 Swift had been on life support for decades, the .22-250 AS A WILDCAT had been eating the Swift's lunch in sales, for decades. Winchester finally pulled the plug, but their replacement didn't do any better, in fact, not as good.
A "semi rimmed" round, (rim dia is .473" so it works with the standard "06" boltface, but a slighly smaller body diameter than the Swift, with a little less taper, and is shorter than the Swift case, so smaller powder capacity, it always seemed to me the .225 Win was doomed from the start.
Add in the fact that within a couple years, Remington finally turned the .22-250 from a wildcat to a factory produced cartridge and that pretty much nailed the lid shut on the .225 WIn, the way it did with the .220 Swift, although much, much sooner.
They sold a few .225s, new stuff always sells some. but I, like a lot of other people looked at the .225, and passed it by.
It's not a bad cartridge, it's just one of those "orphans" today, and ammo is where, and if you can find it.
And, its truly alone, unlike some other "orphans" and niche rounds, there's nothing out there you can easily make .225 Win brass from.
I don't know if Winchester lost money with the .225, but I'm positive they never made anything near what they hoped for.
Unless the .225 you have is in the "collectable" category (or you expect it to be in the future) I'd consider getting it rebarreled to something in current production, if you want to shoot it. If you've got an M70 .225 new in the box with all papers, that's worth something to collectors. If its a shooter grade rifle, get it converted to something you can shoot, or let it gather dust, your call.