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Old April 14, 2019, 12:28 PM   #35
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 16,351
That's correct. If the vertical line of the scope is canted, you then have to dial in some windage as well as elevation to maintain zero as you shift sight settings for longer ranges. If you have a mil-dot scope or another scope with range lines on them, they will be off to the side if there is any cant, and not directly usable.

In general, because most rifles have their bore lines above the center of support for the stock on the shooter's shoulder, the main vertical recoil moment, which affects POI, will be straight up and needs to be co-linear with the vertical reticule hair as well as aligned with the direction of gravitational pull to keep vertical sight adjustments strictly vertical and not contribute to the windage setting. This is why long range shooters put cant levels on their guns. It tells them when they have all those elements aligned at once.

You could also choose to intentionally put a slight cant in the direction of your rifling twist to compensate for wind drift. The old Springfield '03 ladder sights have that cant built in and a scope can make use of it too.

As with much to do with precision shooting at longer ranges, this isn't an issue for someone hunting medium and larger game in places where the shots are never over 200 yards. Where it bites you hard is shooting at ranges long enough for the bullet to be falling faster than flat shooting helps to overcome and where range correction has to be made. Beyond 300-350 yards would be typical numbers for most medium to high power rifles.
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