I have been reloading for over 40 years and just recently discovered an issue with undersized Sierra 185 gr. JHP bullets. I had loaded 500 or so on my Dillon 550b a couple of years back and just had not had the time to shoot them due to other endeavors. I burned thru about 50 the other day using a Enhanced Combat Commander and a XD-s. I noticed that every so often when I cleared the chamber of a live round the bullet was set back. I went and checked the other rounds and found that I could twist the bullets in the case by hand. I ran a bunch thru the Dillon crimping die again and could not get it adjusted to crimp enough to grab the bullet. I measured the bullet expecting to find .451 diameter and they all ran from .4440 - .4445. As a test I Used a RCBS seating die with the stem all the way out and it would not even crimp it tight enough with the die almost touching the shell holder. Anyone else had this issue with factory Sierra projectiles ?...thanks