400 yards is a chip shot for a 308w. As well as it is for a 270 or ol 06. This is another one of those "rhetorical questions"..
Just a few years ago here on the 'fire 300 yds was considered chip shot by some. My how we have progressed.
But, 300 yds in the field is more than a chip shot. Shooting under field conditions ain't the same as at the range..........