them supported shots are really worth practising as they can be a real bummer to get at times.
its best to zero from the prone position as thats the position most shots are taken from. kneelers and standers are the shots that make a difference betweent winning and losing cos most people seem to hit most targets from prone.
therefore if you hit most of youe discipline shots ie kneeling and standing, you get a far better chance of being up there at the end.
also elevated shots up trees are worth practising too, cos the poi seems to strike high. therefore its a good idea to have a good idea of how much you need to aim off. same with steep down hill shots.