I have done my share of the ultra long range shooting and one thing they never mention in articles like this is when your bullet goes from supersonic through trans sonic to sub sonic most accuracy is lost and you are just pissing in the wind.............they just had enough people down range to spot where a drop of piss landed, hence the 69 shots.
btw: When I was doing it I would have never considered using a bipod, thought that was odd
