I bought a stevens 320 yesterday. Im not familiar with shotguns i have experience with ar15s and handguns. I bought some snap caps to practice with but every time i tried to chamber the snap cap it fell out the bottom of the gun. So i figured it might be a problem snap caps so i tried to load a live round. The round instead of going into the magazine tube it came back and got stuck between the bolt and the feed ramp. Idk what to do now so if anyone has advice that would be appreciated.