When I first saw those videos on UT I had no doubts about their authenticity I can't remeber if i posted to back them up. I have certainly backed up other long range shooters on UT. I post as Daystatejoe (even though I shoot airarms now)
I used to love long range shooting. I am no longer a member of a club with a long range but we used to plink coke cans off of the top of the 100yd target frames on still summer evenings at Deadington. Hold over was huge I had to wind the scope down to 6x and my aim point was the thick bar at the bottom of the mildot ret (with a 20 yard zero) so that must be about 6 feet. We got very good at it and on a good day could hit them standing. Aiming was actually pretty simple with that setup I worked on my position, balance and breathing until the bar eclipsed the can and squeezed. Flight time felt like an age with the hit several seconds after the shot. Very good for follow through training though holding position for long enough to watch the hit.
Ohh nearly forgot. The rifle I used was an AAS400 classic running at 10.6ft/lbs (760fps at 8.4gr) the action was all polished and home tuned and the trigger group was polished and re-worked. It was fitted with the standard AA Silencer.
As for power.... Straight through, though the damage was a split in the aluminium on each side rather than a neat hole. The hole on the back of the can was noticably lower than the hole in the front. I'm itching to try shooting at 200yds now but have nowhere to try it.