"The City’s primary defense of the age-18 limitation is to argue that minors have no Second Amendment rights at all. To support this sweeping claim, the City points to some nineteenth-century state laws prohibiting firearm possession by minors and prohibiting firearm sales to minors. Laws of this nature might properly inform the question whether minors have a general right, protected by the Second Amendment, to purchase or possess firearms. But they have little relevance to the issue at hand."
Check the primers on the ammo you didn't shoot yet. Are they fully seated? If the primer is not just below flush with the back of the case, the first hit can seat it better then the second hit ignites it.