Time is never wasted on the range.
From observation, a lot of time on the range actually is wasted (by me as well, I suspect) in shooting off a solid rest while sitting a bench to test various hand-loads for unnecessarily teeny-tiny groups.
'Wasted' might be a bit harsh - but once it shoots 1" or so at 100yds, better results are likely to be obtained in the field by leaving the bench, the rest and the chair and practicing seriously in field positions, and at ranges out to 50-100yds further than you'd think of shooting an uninjured deer.