Go to a few F-class or Prone matches and take a gander at some of the top shooters' 600 targets. In my youth, I shot a few clean 600 yard NM prone targets. Those are true prone with sling, no bipod, no rests, etc.
With several of my varmint and smaller caliber LR rifles, I have shot 50 round days on the 600 yard marmot/ground hog target at out local range, and given we shoot P-dogs well beyond 600yds, well........
I will not even go into the BR/Varmint class guns..........
MR-1FCA – F-Class Repair Center for use at 600 yards on 37" paper Aiming Black (inches) Rings in white (inches)
Aiming Black (inches)
X ring ...................................3.00
10 ring ..................................6.00
9 ring ..................................12.00
8 ring ..................................18.00
7 ring .................................24.00
6 ring .................................30.00
5-ring..................................36.00
And just for fun and entertainment -
View attachment 551406
Shot by Bart Sauter in April 2018. IBS record.