Found this interesting little article while pondering what distance to zero my dedicated 22lr AR upper. He goes over options for different types of rifles, too.
https://savannaharsenal.com/2014/08/01/what-distance-to-zero-your-22lr-rifle-2/
https://savannaharsenal.com/2014/08/01/what-distance-to-zero-your-22lr-rifle-2/