i think buffalo bob did a wonderful job in answering your question. even though i didnt understand most of what he said.
no doubt many things can contribute to a hit or miss when shooting at distance. leaving ammo in a vehicle over a very cold night for example. how do we compensate for that?
the hunters in the area in which i hunt, are about as basic as you can get as for equiptment. ive never seen any of those type things used here.
certainly an accurate click chart is a must. but even that could change from day to day as bob indicated.
the simple solution to all these type of problems is to allways use a spotter.
a miss is a miss regardless of the cause.
good glasses, a good gun with an accurate chart, and a good rangefinder are all the essential tools needed. of coarse it goes without saying, a good rest, and good loads figure in also.
a small branch is all it takes to cause a miss. an unseen cause, but it could sure screw up your mind couldnt it?
use and trust a spotter if your serious about long range.