I use them. They help me. In the grand scheme of things they are cheap, easy to use, and worth having. My rifles all shoot 0.1mil groups (1/3 MOA), so I notice a difference even at 100 if I'm shooting paper. A little bit of cant can change your POI by 0.1mils at 100. At 500, is it causing me to miss a 2/3rds IPSC? No. You'd have to be pretty canted. But I'm likely not going be perfectly centered up on target.How important is a bubble level for 600 yard shots? At what range do they really become necessary? Thanks!
Also, as has been said, that gets magnified the further out you go, especially beyond 500. When working on making 1st round hits as your working out to distance (300-1300) making sure you're not canted helps you make a better wind call because the horizontal error isn't compounded by your cant.
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