Umm that’s a little complicated.
There’s a decent amount of grey area about keeping a gun in your car. I'm not sure if it’s the law but from what I have heard some cops will give you a pain in the ass, and possible other legal repercussions about have a gun in the car and not going directly from your home to the range, hunting groups, etc.
First off the gun must be in the trunk and unload and the ammo must be up front (such as glove box) DO NOT KEEP THE GUN AND THE AMMO TOGETHER OR THE GUN UP FRONT, it’s a big no no in NJ and can get you screwed.umm what else...and no hollow points just in case its a kinda sketchy area in NJ. I think I may have covered everything.
and I'm sorry If i missed anything or screwed anything up I'm not 100% sure about it all seeing as I only put and keep my guns in the car to get to the range or go hunting.