When i check my zero nowadays i lay down using the bypod with a sandbag under the back of the stock, but not always, go back to 100 yards and fire 3 shots, if they are within 2" and 1" high, that is me done and go away happy. In the past i have tended to stay and have a few extra shots but found that i was getting the odd flyer, this is natural as the barrel heats up.
You have to ask yourself the question, do i really need a cloverleaf pattern?. This type of shooting is all well and good on the range or for competitions, but in the field on deer or fox in my mind is totally unecessary.
wadashot