I need some advice , both my daughter and son love to hunt and they have been shooting the cross bow very well. My daughter turns eleven next week and my son is 7 . I found a youth model 500 410 for them and my boy shoots it well but the stock is a little long yet my daughter fits it like a glove. I should say they shoot well off the bench. I do have several two mans stands with the shooting rail to put them in. My delima is the 4/5 ounce slug too little. I'm just worried bout a ill placed shot and a unfound wounded deer. What's your opions should I wait till they can handle a 20 or hope for the best. I let them shoot as much as possible when time allows and the wallet isn't short.