I think many of these guys that say they can shoot dime or nickel size groups are fooling themselves. Just because you shot a 1/2", 200 yd. group once upon a time with a sand bag rest doesn't mean you can do it consistently under field conditions. There is a huge difference between shooting at a game animal at range, that is moving. They characteristically don't give you a lot of time. Even if you tote a range finder everywhere you go, game doesn't usually hang around forever waiting for you to get it out and take a reading. Modern rifles shoot pretty flat up to about 300 yds. but after that bullets start dropping like a lead balloon & knowing the range becomes essential to reliably hitting anything. Military sniper teams generally have a spotter with a spotting scope & a range finder. I don't think they take very many running shots.
There is a time & place for most everything. There are guys that take shooting benches, range finders, spotting scopes & such in the field & set up where they can see game at extreme range. If hauling a pickup truck full of junk everywhere you hunt works for you, go for it but that severely restricts flexibility & doesn't fit my hunting situation.
I just re-read some of the previous posts & was reminded of a hunt my gunsmith told me about. This guy is an accomplished rifle shot. He shoots on a rifle team & claims to have made a number of 500 yd. or so shots. He was on a stand overlooking a cut hay field when a buck came out at 100 yds. or so. If this had happened to me, I wouldn't have told anybody! So, he shoots & misses. This buck is rut crazy & trying hard to commit suicide & comes out again & again & he misses again & again. My gunsmith finally goes out in the field & climbs on top of a big hay bail & the buck comes out yet another time & he finally kills it. Go figure! I don't know if there is a lesson in this or not but it makes me wonder.