I've had very good success ranging antelope out to 400-500 yds., and a few coyotes. Reticle-rangefinding is a lot of fun to play with especially on tgts. of known dimension.
Don't know too many guys who wouldn't take a poke at a 400ish coyote, and most won't KNOW the distance precisely. But since there is a "ruler" inside most optics in the form of any multi-stadia reticle, it will almost always be more accurate than just guessing. Here are a couple Utubes I put together on RRing with any multi-stadia reticle [not just milliradian]--