Actually parallax in yards, at least in America is quite useful. Yes I realize parallax really needs to be dialed in but in matches or on the clock it is certainly acceptable and faster to dial to the approximated yardage on the parallax knob that corresponds to the range finder or match card. Fine tuning it for when you have lots of time static shooting. In short, I prefer yards for parallax (here in America) which is a measure of distance and mils for the adjustments which is a measure of angle. The only match I have been to that was a complete shit show was with a bunch of fed boys that wanted to play in Meters but couldn't keep gear straight between the American standard of yard in rangefinders and dope cards and the target distances in meters. Unfortunately they are not interchangeable.
Yards/Meters is close enough for parallax. Even at 1000 yards it’s only 85ish yards difference, which isn’t enough parallax error to matter, not to mention you’re probably out of numbers on the knob by then anyway.
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