Ten shot groups definitely give you more insight into dispersion (range of hits off of point of aim), and so help to better adjust POA to be centered where you want the average shot centered.
I started using the ten shot groups on the 24hourcampfire black rifle challenge targets, and now all of my friends who care about accuracy are piling on.
Ten shot groups tell me more about minute of ground squirrel, which is what I'm using varmint ammo for.
