I swapped scopes on an AR and my 40X. The AR had a 20X Super Sniper, the 40X a 16X Super Sniper. I wanted more power on the 40X for shooting down at the OTC.
In the process, I discovered the reticle on the 20X was canted a degree or so. I generally test every scope before mounting, but this one slipped past me. It doesn't matter much (I set the erector plumb, not the reticle), but it took me a few minutes to figure out what was going on.

