Hello, I am planning on turning a nice 1000yd canyon into a range with circular steel targets. I've pretty much worked out the type of steel, thickness, etc. The whole point is to extend my max hunting range. My question is what size should I use? I don't want these to be easy to hit, as I'm trying to get better. I've been shooting rocks in this canyon and it seems to me that 1MOA to about 600, and 1.5MOA to 1000 would be challenging, but not impossible. It's hard to tell how big rocks are looking at them from that far away though. Anyone have any thoughts? Shane ETA: I forgot to mention, most of my hunting is for coyotes, with a 7mm. In my experience, anywhere in the front half drops them pretty good. Also interested in Elk. These might factor into size.