I read about 1" 5 shot groups at 100 yards on the internet.
That was before the www had gun forums, that was on usenet rec.guns.

I tried for years to get a 1" group. It seemed that everyone on the internet got them, but at the ranges I visited, I never saw one.
Then in the 1990's I was at Issaquah range and saw a man, in his 20's who was there every day and had just got a new rabbit ear rear bag, get a 1" group.
Many at the range crowded around and asked how he did it, like asking someone how they caught a giant fish. He said he could only do it with Federal Gold match ammo, no other ammo would do, and he was shooting a Winchester M70 Coyote .223.

I go to most gun shows, where 10,000 people show up, and I have never seen a .223 M70 for sale.
I am still looking.

I got my 1" group in 2002.
But I will still buy an M70 .223 if I see one.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps