ever watch a guy at the gym stop the bar a half inch above his chest? he might get the first rep right, but it seems to me that all the other reps creep higher and higher. there are really two issues here: 1. he should be using a lighter weight to control the bar better (i.e. lightly touching the chest) and 2. he needs more confidence to bring the bar down all the way to the chest. personally, i bring the bar and have it slightly touch my chest - and i always have a spotter when reaching my max. the full range of motion will tap all the muscles that should be incorporated in the bp, especially those when the bar is nearest the chest (including the upper back and anterior and medial delt), and for me, it signals when i want to explode the weight off my chest when performing dynamic bp. my suggestions? control the eccentric portion of the bp so that when you slightly touch (and not rest) the bar on your chest you are not bouncing the weight any. or, put a 1/2 inch towel on your sternum and when the bar touches the towel (which should not add any 'bounce' to the concentric portion) proceed to lift the weight. or, if you really want to exercise your ROM, bring down the weight (nothing near your max though), let it rest on the point the bar touches your chest for a few seconds, and then bring the weight up. in the last case, you have no eccentric elasticity or bounce and you are really practicing the start of the concentric portion.