@XFlareX: the answer to your question is here (http://shellshocklive.forumify.com/viewtopic.php?id=1569) scroll down, one of the responses even has a link to his website.
@Shin_gouki: took me a while to figure this out. but if you pay attention closely, there are angles in-between each angle. like 100/74.1 and 100/74.5. err... hard to explain but play around with the game in the firing range you you will see. click and drag to shoot at the front part of 100/74. and then try to move it slightly over without moving to angle 100/75. the shot will land in different spots. this game is INCREDIBLY accurate.