Hello
Lurker who finally registered, these seem like pretty civil forums.
I shoot centerfire benchrest in NBRSA matches and our targets do have the square on them.
Very few shooters I compete with will print their groups in the square athough it is legal to do so.
I was taught the square is for trying to get a handle on shooting in mirage conditions. Since many of us use 36x or higher powered scopes mirage can be a real problem. (I use a 45x)
On days with heavy mirage, the square can be used to try and get a more consistent poa than the mothball.
Since you all like pics, here is my set up. It is a viper drop-port with a jewell trigger (1.5 oz.), currently a krieger 13.5 twist barrel (chambered for 6mm PPC) and a luepold comp. 45x.. At a 100 yards an decent group of 5 can be covered with an aspirin, at 200 yards a dime.
Take care