Field shooting in my definition is exactly as said, in the field, walking, stalking with continuously variable conditions and using a backpack or mount of dirt as a rest. Shooting over terraced fields with variable wind conditions, significant eddy currents with game that limits the time you have to aquire your target and fire.
I do not consider a bench built or carried into the field as field shooting.
Under field conditions your ability to make hits on small targets is much more difficult, hyper velocity at 1/2 minute of accuracy is much more useful than 1/4 minutes of accuracy at 200 or 300 FPS less due to the additional difficulty in ranging. Reduced time of flight is more important than ballistic coefficient.
As an example my 223 shoots 55 grain projectiles at 3200 FPS in wind at 2 3/4 to 3 1/4 groups at 300 yards. While shooting 1 1/16 in calm winds. The same rifle shoots a 40 grain at 3900 FPS at 1 1/2 to 2 in wind and 1 1/8 on calm days at 300 yards. Also significantly less drop.
