As you know I go to some driven hunts in Germany every year and many in Sweden. You know in advance what species that are allowed. Sex identification is important, that could be a problem with Wildboars if you are not familiar with them. Female Wildboars are nearly always not allowed. It´s easier with Red deer and Fallow deer, the males size is rather easy to decide from the antlets. You are always told in advance what size that are allowed. In Germany on these hunts I go to, big ones are never allowed. They hunt them selectively. In Sweden there could be one or more big ones at one hunt. And always the youngsters before the female. So it could be hard to decide when there are many animals at the same time. It´s not popular if you destroy the meat. I have heard on some hunts that if People don´t feel secure, don´t shoot on running animals. A lot of practise is necessery.