Actually one of my current hobbies is guessing distances, then pacing them off to see how far off I was.
Im always way off on up-hill and lateral down-hill distances.
So far some of my guesses have been off by as much as 40%.
Mind you Im guessing distances.
I remember running the 440 in highschool track now days its the 400 meters, strech out that lap on the track as a straight line and a deck of aying cards is mighty small.
So through trial and error Im improving.
Hell Id be happay as a clam if I could hit a 5 gallon pail at 500 yds (off hand).
As for pump or bolt?
The one thing I could mention is the pump may fit a family of left and right handed shooters if your limited to having a single deer rifle.
Didnt Savage make a model 170 30-30 win pump?