I shoot the FBI Combat Match every week.The first segment of the match comprises four targets at 50 yards.These are shot at prone,sitting/kneeling,left side barricade,and right side barricade.Six shots on each target.The ten ring is 6in X 4in.It is not uncommon for shooters to get all six shots in at least one ten ring,mostly on the prone or a favoured barricade side----I have done it myself,but not very often.I shoot a Model 16 S&W .32 H&R Magnum 6in and load it with 2.5gr W231 behind a 98gr semi-wadcutter.The sight picture is vital to accuracy,and this is affected by the light too.The most important thing is to see the front sight clearly,and I have two pairs of glasses I swap between.Often the target is slightly blurred which doesn't really matter as long as the sight is in the centre--is is essential to execute the shot properly,and watch the process all the way through.AND follow through.
Hope this helps.