I have never heard that said by Berger but if it shoots well enough to be used in a tournament or match, why not use it for an animal especially a coyote where you don't care about eating a bullet fragment, etc. I also shoot the Berger 50 grain target match out of my .22-250 and have hundreds of coyotes harvested with that bullet as well. It is very devastating as well. Not bad on fur either, but not as good as the .17.
The hard thing to explain to people who haven't used this load on a coyote is the combination of speed, expansion, and weight seems to almost always keep the bullet inside the coyote, but penetrate far enough and expand enough to turn the inside of a coyote to mush. I have shot many other calibers at coyotes including .204, 22-250, 6WOA, .243, and 25-06. I have yet to use a caliber that is more fur friendly but still devastating to the coyote. You can almost always get the same result. You can't hardly see where you shot them and they lay sleeping on the ground. It is cool to see.
Honestly, I don't shoot the .17 as much as I used to. It isn't because it isn't a good gun/round, as it is. I love the minimal recoil resulting in seeing your sight picture through the shot. When fur prices plummeted many years ago, I became less concerned about pelt damage and beefed up to a bit heavier caliber. Many of the lighter caliber bullets are prone to more wind drift. It isn't as bad as many would lead you to believe, but it is something to consider. Prices came back last year a lot and if they keep going up, the .17 may have to drop some additional coyotes this year.
On your .223 comment, I own several 22-250's but not a .223, so not sure, but you may need a special barrel twist to handle 75 grain bullets out of it which you may already be aware of.