Slope Doper

The slope Doper is a time tested piece of kit I would recommend for any long range shooter have in their goody bag. Batteries die on the electronic gadgets at the worst possible time, so having a manual backup to help figure firing solutions is critical.

Using this device is extremely easy and straight forward. You simply take your range in yards and multiply it by the slope angle factor given for the angle you are shooting at. This goes up to a 90 degree angle. I have inclued the cosines below for corrected angle shooting.Distance X Cosine = correct range for angle firing.10 degrees X .98415 degrees X .96520 degrees X .93925 degrees X .90630 degrees X .86635 degrees X .81940 degrees X .76645 degrees X .70750 degrees X .64255 degrees X .57360 degrees X .50065 degrees X .42270 degrees X .34275 degrees X .25880 degrees X .17385 degrees X .08790 degrees X 0

If you shoot long distance, you have to have this.

This is a fantastic quick calculator for uphill and downhill shots!

very easy and simple to use

I had to use this tool for an advanced LEO tactical marksman course. It works as described but all of us in the program had difficulty getting accurate bearings. The needles moved almost frictionlessly which created a common problem- The plumb went beyond and came to rest (exaggerated angle) or, it bounced back and caught friction prematurely (underrated angle.) This was most problematic when using the tool alone. To use it you “sight” down the spine (top) of the tool, then stop when you see your target, then you pinch the needle to the measuring scale and finally, you turn it to face you to read your bearing. There’s a lot of room in this process to make a mistake. When working with a spotter, these issues become negligible but this brings up a couple other thoughts.First, if the measuring face gets bent, warped, punctured, etc. then you’re S.O.L. The needle won’t swing past this point and it’s game over. Second, there are so many other inclinometers out there that are more durable, allow solo use (without worry) and are more accurate. (Try searching in hardware, not in shooting sports.) Personally, I always use a laser rangefinder (with inclinometer) but if I want to test myself, or if I’m being tested, then I use my Suuntu MC-2 compass, my cosine tables and scrap paper (data book.)In summary, I recommend the Slope Doper as a training tool that will help you understand the basic trigonometry that goes into long-range shooting (and land nav) but for operational use or shooting competitions, look elsewhere.Thanks for reading.