Many people shooting from a bench square-off with the stock and target, making their stationary mass take the recoil. Any day at the range, this is evident, along with the resulting flinching. The body must absorb a great deal of the total recoil before it begins to move, which helps disapates the remaining force.
: If a person sits in a more sideways position, the shoulder and head move more easily, which helps aborbs the shock & converting it into more of a rolling punch. I personally find the .30 cal magnums kick more than the .375H&H, due to their 'sharp' recoil & generally lighter weight.
: When a person shoots standing, the body rolls with the punch, which disapates the recoil. It is the best way of practising anyway. Free standing and standing with a rest on a tree or vertical roof support, with the back of the hand resting against the support. Never place the rifle's stock against a solid object as the shot will be thrown away from that object, be it left or right depending on which side the stock is touching. This goes for a suport underneath the stock as well. It must be padded with a soft object, be it your hat, hand or heavy glove.
: Most people can hit reasonably well sitting at a bench, but there are few benches in the field. Offhand practise is where time is best spent - the best of both worlds of reducing recoil and practising in positions more akin to hunting situations. Kneeling is another position that needs to be practised and which also is a good recoil absorber. Any position where the body is free to move, helps with the heavy kickers, just as 500gr. and .500Nitro said.
: Start close and increase the range as skill is aquired.
: Reducing loads is another way of developing a 'shoulder' that is recoil resistant. Increase the loads as the preceding ones become tame. Some manuals like Speer, list 'reduced' loads which are easy kickers in each calibre.