paulsantos had the best solution to send it back. What you can do is clean the bore and chamber. It sounds like headspacing or the bullet is stopping it. What you can do after you clean the chamber is take a round that you didn't fit, clean the oil off it with some alcohol, then black marker up the whole cartridge including the bullet. Went dry insert it in the chamber and give it a couple good pushes with your fingers, then carefully remove it and see where the marker ink is wore off. You can repeat this one or two times to be certain of the spot that is wore off. Either the shoulder isn't back far enough on your cartridge, or the chamber shoulder isn't deep enough, or the bullet is loaded out too far and hitting the throad taper and/or rifling. You marked cartridge should tell you something.
Is this factory ammo?