So I finally had a chance to test out my first batch of 5.56/.223 reloads. All of the brass was once fired Lake City, swaged. Primers were Federal. I use the RCBS X Die on a Hornady LNL 5 stage. Out of the 80 rounds that I loaded up, 2 of them did not fire. They were both the first ones of my 5 round batches. They seemed to chamber just fine in my AR, but they wouldn't fire and the bolt would lock up. Both times I couldn't free it up by yanking on the charging handle, so I had to take it apart and ram a screwdriver between the bolt and the upper to get it to move. Both times the other 4 rounds of the batch would run just fine, and for SnG's I would load up the funky round back in the magazine, and both times it would fire on the 2nd go around. I used Varget with a variety of different projectiles, 4 different loadings per projectile, going up in pressure by .5 grains, 5 rounds of each loading. None of them exceeded the max OAL, which I show as 2.260". Any suggestions?