The Nary-a-Land Stattes Polizie carry out their 'orders' w/o question. Pure Socialism in action.
I am not a lawyer, but this looks to me like if you want to bring your pistols and take your BIL to the range for some "informal target practice", and once you cross the Mason-Dixon you go straight away to your Brother-in-laws house, and keep everything unloaded (including the magazines) and go to and from the range with no stops, easy-as-cake! I would not do anything stupid while I was on the road, you know, both hands on the wheel, look straight ahead, use your turn signals, say baaaaaa!
I know certain parts of PA *cough*PHILADELPHIA*cough* aren't the best for gunnies either, but as a whole, life seems better for our type around your way than it does here.
(b) Exceptions. This section does not prohibit:
.
(3) The carrying of a handgun on the person or in the vehicle while the person is transporting the handgun...between bona fide residences of the person, ...
(4) The wearing, carrying, or transporting by a person of a handgun used in connection with an organized military activity, a target shoot, formal or informal target practice, a sporting event, .....while the person is engaged in, on the way to, or returning from that activity if each handgun is unloaded and carried in an enclosed case or enclosed holster;