The difference between field accuracy and target accuracy is the same whether you shoot a regular cartridge or a magnum.I always use a rest or bipod when shooting at longer distances whether shooting targets or game animals.I use a laser rangefinder so I am sure of the distance.I shoot my rifles at varying ranges out to 500 yards on a regular basis so I am very familiar with the trajectory of my loads and stay in tune by practising regularly.The cartridges that I use have more than enough power for the game I hunt to well over 500 yards which is my personal limit for shots on game.