790.19 Shooting into or throwing deadly missiles into dwellings, public or private buildings, occupied or not occupied; vessels, aircraft, buses, railroad cars, streetcars, or other vehicles.—Whoever, wantonly or maliciously, shoots at, within, or into, or throws any missile or hurls or projects a stone or other hard substance which would produce death or great bodily harm, at, within, or in any public or private building, occupied or unoccupied, or public or private bus or any train, locomotive, railway car, caboose, cable railway car, street railway car, monorail car, or vehicle of any kind which is being used or occupied by any person, or any boat, vessel, ship, or barge lying in or plying the waters of this state, or aircraft flying through the airspace of this state shall be guilty of a felony of the second degree, punishable as provided in s. 775.082, s. 775.083, or s. 775.084.
FS § 790.19 790.19
This would seem to apply, but there may be a loophole, as it was Mr. Chapman's house and he may have been shooting in a safe place. See Florida Statute § 790.725(j) (Protecting the rights of a person performing target practice under safe conditions and in a safe place not prohibited by law). Further, indoor shooting ranges are expressly allowed.
To get a full opinion on this, would take a survey of Florida case law and regs, as well as the county law where Mr. Chapman lives. Also, it would take a Florida law license. But the state does have some unique firearms laws that are quite different from what you might see in Seattle.