It was a interesting artical worth the read but I am one that will practice at marked distiances 10-15-20 but it is only a half doz or less at each one then I just walk around(within 30 yrds) and take shots.I find this to be very helpfull to me,I am lucky enough to have a small hill on my property so I can shoot down and up(it rises 14ft in 40 ft)just a nice angle to challange a guy a little....