Got my first S&W a week or so ago. Has been cleaned and lubed, but not shot yet. My issue is with either full magazine inserted with a closed slide, it's very hard to get the mag seated. Then racking the slide is very jerky and requires way more effort than any gun I have experience with. It is easier the fewer rounds that's are in it.

Is this a mag spring issue? Gun issue? I've tried two kinds of ammo. One HP one FMJ. Should I contact S&W?