Two things to remember:
1) FOPA only covers the gun. It is silent on mags, ammo, etc.
2) Hollowpoints are basically illegal in NJ.
It's all about risk tolerance. Yes, the chances of getting stopped or breaking down and a NJ cop doing an illegal search are small, but the consequences can be astronomical.
2, IIRC, only applies if you're actually carrying them in the gun, as a standalone charge, they're not "always posession illegal, no matter what". The NJ HP ban is context
specific. It's definitely not "HPs are illegal under all conditions" in NJ.
as far as 1 is concerned if your shit is locked up right they have to satisfy a 4A requirements for searches to be legal to even getting to see the "stuff". this places the "state" on a bad footing if they try to screw someone, vs a "loose gun in a car" thing, which is different. See also "reasonable person". I've never heard of a FOPA case where someone got "waived" on the gun but whacked on something else, etc. This is another thing that ayoobists and pant shitters like to make up to make people afraid of everything.
ETA: as far as "small" goes I would say "microscopically small". As in my odds are greater of "getting killed by a car if I walked to the grocery store and back" kind of small.
In most states outside of the PAPD adventurism, when you see an unlawful possession arrest, 99.9% of these people literally shitmagnet the charges to themselves.
"kid had a rifle in backseat of the car with some stuff on top of it but 2in of stock was still visible. targets and other stuff still visible. was wearing a 50 BMG necklace"
"cop pulls guy over, cop sees grip of handgun protruding from under seat after shining his light into the vehicle"
"guy was drunk driving, hits pole, cops find loose gun"
etc, etc ad nauseam. all stuff that is easily avoided by not being retarded.