Rifle Scopes Good video on parallax, and I have a few questions for you guys

[Hootiewho]

I found this video with Leupold discussing parallax and thought it does a good job of breaking the subject down Barney style, especially for a new shooter.

Understanding Parallax with Leupold - YouTube

My question is this: The guy from leupold states that if you are set at 150 yds and have a 44mm objective lens, then shoot a target at 300 yards that your parallax being off will induce an error of the size of the objective. At 600 yards that doubles again. I have not had time to play around with my S&B just to get an idea of how "off" I can be at 600 yards + from having my parallax of, but for those here who are experienced, is this calculation about right.

Another question is do you guys generally pick a mid-range to run the parallax at on a timed match stage with 1-2moaish targets and not touch it, or focus on the furtherest target, or adjust for each while making turret adjustments.

 

[Killswitch Engage]

That's an awful big error. Can't say I've seen parallax induce an error of 20-30 moa which would about have to be what a 44mm objective at that distance would be. I've seen parallax cause shift of 1-3moa on average when checking it.

 

[stranded]

I read that statement to mean error the size of the objective, 44mm, then at 600yds, 88mm. This seems more in line with my experience. ( the 300yds, that is) I have been wrong before.