The .222 was known as THE most accurate round ever made in the 50s and early 60s...it owned EVERY benchrest record from that time, and during the same time was the most popular Turkey rifle round in PA, which also doubled as a deer round for "one rifle hunters." Granted, it is a little light for deer but MANY deer in PA have been killed with it...in fact when I lived there one writer guessed that the only round that killed more deer in PA was the .30-30...because so MANY Pennsylvania hunters owned them, granted, mainly for TURKEY.
My Wife's Grandpa owned a Savage in .222 for his Turkey gun, and that was the rifle she carried when she hunted deer with him.
The .222 was the round the ORIGINAL AR-15 from Armalite was designed around...
About that same time Remington brought out the .222 Magnum, with a little more powder capacity, which the AR was then designed to shoot, but then they came out with a compromise, which became the .223....
The .22 Magnum NEVER caught on, and the only reason the .223 is more popular than the .222 is the many thousands more military cases made for it which made it cheaper to handload....and thus able to develop loads ALMOST as accurate as the .222, which is why more people shoot .223 NOW...but as late as the early 70s the .222 was the more ACCURATE round....
What somebody said, something like that EVERY .222 load is accurate, is right on...you have to WORK (or really screw up?

) to load one that won't shoot under 1/2" or less....from just about any rifle, much less Grandpa's Savage...
Funny thing, though, I ALMOST bought a Sako .222 for a walking around varmint gun before I bought my Predator which would suit me better, (AND was a lot cheaper

)...
...so I was looking for .222 components at the time...
...and noticed that during the recent ammo "crisis" EVERYBODY that sold new brass before the crisis still had new .222 Winchester or Remington cases available all during the crisis, at decent prices, (and also cases for my .220 Swift for that matter) while NOBODY had .223 cases....for what it is worth.
While I am happy with my .223 Predator, I STILL will own a .222 some day, even if just because my wife remembers that old Savage of her Grandpa so fondly....