I've used a couple of doubles that were made with no standing rear sight. I didn't have the confidence at first to just plant the front sight on the animal and pull the trigger, so I used to walk around with the 1st blade up and aim low. I did find out in the end that the point and shoot method really does work, at reasonably close ranges anyway. But then again, I suppose thats what they were made for. As I hunt most of the time in sunflowers, sorghum etc. with only doubles, just about all of my shooting is now done this way, as you just don't have time to do it any other way.
I do have a bit of a recording of this type of hunting and will bung it on soon.