Why do you think that only a few can shoot and hit with big rifles? There's no mystery to it, and anyone in good physical condition, who is well grounded in practical field marksmanship, and who has the desire to master these rifles, can do so. Provided the rifle is not unusually light for the cartridge, provided the stock fits the shooter, and provided its equipped with a good quality recoil pad, these rifles are designed to be used by normal people.
There are a few considerations which should be observed when shooting a hard kicker though. When you've had enough, its time to take a break; if you allow the rifle to hurt you, it will be difficult to overcome the effects that will manifest themselves as flinching. If the front swivel bites your hand, move it. If your knuckle is rapped by the rear bow of the trigger guard, install a knuckle deflector. If the scope is mounted too far rearward to avoid being hit, do whatever you need to do to move it ahead, even if it means you cannot use all of the scope's magnification. If the scope cannot be moved far enough ahead to avoid being hit, remove it and shoot with iron sights only, or purchase mounts which will allow you to move the scope forward. If you find that factory loads are too much of a good thing, handload light loads, and over time work up to the full potential of the cartridge. Begin shooting offhand until you build up confidence in your ability to handle the rifle. Once you've mastered offhand shooting, try a supported position like kneeling or sitting that will allow you to move with the recoil of the rifle. Once you've mastered those, try shooting from those positions slung up, if slinging up is your habit. Once these have been mastered, try shooting prone if you are comfortable with the idea of trying it, but keep the shot string to 3 rounds or less at the start. By now you've fired a few hundred full powered loads, and you can say that you can shoot a big rifle and hit with it.
