The shooting contest event still uses only a few units of ammunition even after the adjustment to the ammunition count done in an earlier patch e.g. it only used 6 units of ammo for +1 resolve on two of my BBs, the same as before the adjustment patch.
This doesn’t seem correct and even the event text describes them shooting for “quite some time” and that the targets are more arrows than targets, which wouldn’t seem possible if they only shot 6 arrows.
See screenshot http://steamcommunity.com/sharedfiles/filedetails/?id=768429129