Corey, did the whole case stick or did the head of the case separate and leave th body in the chamber? If it is the latter, you had a separation usually caused by the case stretching do to being over worked. ( Full lengthed sized too many times.) If the whole case is in the chamber, there may have been some debris in the chamber, or the case was too long. Do you have a case gage or a sliding caliper? If so, measure the case length and check it against the reloading manuel. Could be someone has trimed those cases that you think are short too much.