Looking to buy a 3.5-12x40 or 4-16x42 size scope for my father. He has a 30-06 browning that he’s carried for decades and he needs a new scope. He has a rifle elk tag later this year and I’m looking at either vortex, Leopold, or Nikon and trying to keep it in the $300-$600 range. He’s 71 yrs old and this is most likely his last rifle hunt for elk hence not wanting to go too expensive on the glass. I would appreciate any advice or thoughts on different models. Considering the vx3i, prostaff 5 or 7, or a couple different vortex options as of now.