Remingtons have held a long and deserved bad reputation of jamming. I had hoped the new 750 would have corrected the issues far too often seen with the 742s and 7400s.
Sadly, they're accurately called Remington JAM-O-MATICS for a reason.
I hope you get the bugs worked out.
By the way, before anyone thinks otherwise, we kept our Remingtons cleaned and properly lubed. So NO, we didn't have jams due to poor maintenance.