I have a Leupold one.
It's not accurate, as in if I dial on to the zero, the rifle will be way off. But if I put it on a sighted rifle and remember where the crosshair sits on the grid, and use that reference on another rifle it gets me on the paper. It's handy for checking your zero without firing a shot if you can remember the reference point.
Bearing mind different loads often shoot to different points in the same rifle, never take anyone's word that boresiters are the bees knees.
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