Looks like these are the bullets Remington loads in their .22 Hornet ammo, rather than a .223" bullet. If you've got experience with the factory Remington Hornet SP ammo I'd appreciate hearing of that.
When I was in high school, I was rocking an H&R singlebarrel in .22 Hornet, and I used the Remington softpoint loads on groundhogs. Buying factory ammo for the Hornet in those days meant buying the Remington SPs or Winchester HPs, those loads were "known" to be the best shooting loads (and it didn't work the other way, Winchester SPs sucked, so did the Remington HPs). All those loads from that time frame were either 45 or 46gr. loads, the 34 HP and 35 VMax loads did not exist then.
That bullet really worked well on Southern Indiana groundhogs. I made some ear shots on a few, and the brains always exited the mouth of the critter. Very decisive for a mild-mannered Hornet.
Granted, I was an inexperienced high-school kid at the time, with a cheap little rifle and a no-name 4x scope on it, but it worked and worked well. If I weren't a "seasoned handloader", I'd probably still be using that load in the CZ 527 I use now. Now I use a 34gr. hollowpoint on top of 1680, but if I were stuck with factory ammo, I'd be looking for that Remington load.
I also have an excessive number of other varmint rifles, if there is such a thing, but the Hornets (.17 and .22) are about as much fun as anyone needs.