The mule deer in the picture under my name was taken in open country in southern New Mexico at a distance of 20-25 yards. If it had been any further, I wouldn't have shot at it. As it was, I misjudged the distance and rather than hitting halfway up the body I hit about 3" low and had a heart shot, which turned out fine. It is easy to misjudge distance in open country, as things seem to be closer than they really are. I already knew that, and had been practicing for that, but I hit low anyway.
Open country in New Mexico means hills, arroyos, and skattered bushes and pinon pines, meaning that you do have things to hide behind, just not very many of them.
I don't know if Alberta is just flat plains where you can see for miles. If that's true, it would be a tougher problem. We hunted elk in northern New Mexico one year that was like that, but there was a little gulley that I could lay down in and wait for them to come up to me. I guess there's always something you can try.
Howard Hill might be good enough to take a shot at a deer at 40 yards, but not me, unless it's a 3D target.