Depends on the shooter.
Walther is one.
They have evolved to be more accurate.
Because they are effective, accurate weapon.
When compared to early rifles, present day rifles are smaller, lighter, less expensive, more accurate, have a greater range and fire much more quickly.
Air rifles can push a lead pellet at or close to the speed of sound. Yes they are lethal, and very accurate.
Rifling in the barrels
Anschutz and Remington 700 are regarded to be most accurate rifles in the world. NOMAN
Better than 90% of the people who shoot them.
There are several very accurate air guns and rifles. Air rifles used in the Olympics are the finest. As an example the P75 Biathlon competition air rifle will cost you around $2,623. BB Guns on the other hand are not very accurate beyond 30 feet.
Accurate enough for its intended use.----------------------- New Answer---------------------------------------The Avanti line of air rifles is considered to be Daisy finest line of air rifles. These are considered to be of Competition quality. The 853 only fires at 480 FPS ( This is common with Competition air rifles.) But it's accuracy is well known.
It is generally accepted the the pellet rifles used in the Olympics are the finest made. Look up rifles made by FEINWERKBAU WESTINGER & ALTENBURGER
I have seen these rifles advertised for around $200. They were only made for about 3 years back in the 1930s. Very nice little rifles. I shot one, and was amazed at how accurate it was given the rifles age and wear.