If to hit modifiers result in a required score of 7 or more then it is still possible to score a hit though very unlikely. As it is impossible to roll a 7 on a D6 you will need to first roll a 6, and then for each shot scoring a 6 you will need to roll a further score as shown on the chart below, so for example in order to score an 8 you must roll a 6 followed by a 5 or more. If you require a score of 10 or greater then it is impossible to hit.