That 2 shot method LOOKS great, but it can have you chasing your tail, especially for an inexperienced (someone that doesn't shoot over a bench on a monthly basis).

All that video shows you to do is shoot one shot, adjust your scope (don't have to have a friend adjust it while you're holding still), then shoot another to verify. Personally, that's an F'ing joke, especially the way they showed how to do it by "holding the rifle perfectly still".

What happens if you move the rifle ever so slightly? Now you'd be moving your crosshairs to some arbitrary point on the target. You shoot your next shot, and it won't be on target, so now you try to adjust again, but you move a tiny bit again? All you'll end up doing is running circles around the target.

Or what if you and your rifle are a 2" group pairing? You shoot, your bullet strikes 1" to the left. So you move your crosshairs to the left to meet the strike. But unfortunately for you, that was a left flier, and your crosshairs WERE perfectly centered before you moved. Now when you fire your next shot, the left flier will actually be 2" to the left.

There's no excuse for cutting corners at the range. Take 3 shots, measure the center of the group, measure the distance from center to the center of the target, adjust your scope accordingly, take 3 more to make sure you're centered over the bullseye. If you're not, repeat.

That video method is a joke, and will only work for someone using a gunvise that cannot move AND that knows his rifle's precision AND can fire a reliably precise shot every time. In general, someone that has all of those attributes knows better than to waste their time using that method.