Seating into the lands is another way to achieve maximum accuracy and the load is worked up carefully usually in a very finely tuned benchrest rifle...BUT...it is also a way to center a round in the chamber so it starts out straighter/more centered so to speak.
Many factory chambers are sloppy beyond imagination. I've found that seating into the lands can help a lousy chambered rifle shoot much better, BUT, you have to work the load up slowly because of the pressure spike associated with the bullet being stuck into the lands.
I've also found factory chambers that were "short" and a loaded, ejected round showed land engraving on the bullet which meant it was shoved into the lands a certain amount. A lot of this might be happenen and no one has noticed or was not concerned about it if they DID see it.
For "normal" factory rifles and hunting I WOULDN'T stuff a bullet up the snout hard for a lot of reasons, but 0.020" isn't very much..you can hardly see that amount of engraving on a bullet. Check it out with a pair of calipers or mic.
Some people DO seat their bullets long and let the lands push the bullet back...it was popular way back in the day when I was benchresting, it was also done in Schuetzen rifle competition and I know some BP shooters that do it with their paper patched loads. This is done in conjunction with carefull load workup and isn't for the uninitiated.
Luck