Yes, but not on my 338 yet, only got a 2% chance at anything over 300yds and I'm not geared up for anything but quick shots with Zero at 200. If I ever go Long Time-Long Range U-BET and will get the other knobs to go with it.
Made my own in 1997 from $3 worth of school supplies and a broken level's bubble, for slinging 2114s at ELK in Colorado's Weminuche Wilderness.
We never got on 60 deg slopes, about 45 < 50 is all we could hold on to, but the physics of the 60yd shot on the 60deg slope requiring the 30 yd pin left me with a healthy respect for gravity at long distance.
Can't beat knowing where your projectile is going to be at all distances.
One of them " Don't Screw Around With Mother Nature things"!......