Re: 1000 yard rangefinder?
I have Leica's 1600crf. Using any rangefinder at longer distances is just like using the rifle at longer distances- you need solid support. I rest it on the rifle if I am prone, on my shooting sticks if sitting, or on my tripod (sit it right on top of the bino or the spotter) when glassing. The local farms have provided test targets (no, repeat NO rifle anywhere around for this) and I have gotten repeat readings out past 1000 yards on cattle and horses. It even bounces off buildings at 1977 yards, so far that is the longest return I have been able to get. The 1600 also gives angle from horizontal, temperature, and atmospheric pressure (in PSI, which I then convert to altitude with a cheat sheet). It also has a ballistic calculator which has preset trajectories on a menu- you pick the one which best matches your load. I don't think it works past 500 yards, but I can't say for certain, because I have never used it, preferring my own drop charts for my handloads.