I had prep some 40SW brass and primed them some months ago and lefted them covered with a shop towel on the reloading bench.When I reloaded them with 4.8grs 231 Win.powder the first round stuck it the barrel with in the first 1in. of the barrel. I knocked it out with a dowel, second round did the same. I pulled the third round with a bullet puller and fired the blank and it made the same noise as a new reloaded blank,the flash pan burn test was a yellow flame a lots of residue left on pan. What do you think is wrong here?