I've seen some with 3 shot groups between 1/4" and 1/2" with cartridges suitable for most hunting (like a 30-06).
Aren't Cooper's test targets shot in a 50 yard tunnel?
I don't know if that is correct. I either didn't notice the yardage on the test targets or it isn't shown. The salesman in the store said 100 yards and since I wasn't ready to buy right then, I didn't question that.