I recently encountered an issue on a run of 50 I loaded for my .338LM, which I didn't experience on the previous run, using the same recycled brass, projectiles and powder. Pertinent info: Brass: Once-used S&B (Lapua from what I can tell) Powder: Hodgdon Retumbo Primers: Federal Projectiles: Hornady 225gr SST Dimensions: I'm using standard dimensions (OAL, powder load...etc) for everything at this juncture as these were made to be "safe" hunting rounds for the rifle. I had 5x out of the 50 that had a visible bulge in the shoulder. I caught this when the first one wouldn't chamber, resulting in my inspection of subsequent rounds. 45 of them chambered and operated without issue. Nothing changed during the reloading process, my buddy mentioned he thought it was due to too much lube on the cases when they were done. I was thinking maybe I had the seating die a bit too tight (for the crimp)? Some pics: 1. This is one of the other ones, fired, no problems: 2. Bottom is an S&B (unfired, not a reload), middle is one of the bulged reloads, top is a Federal soft tip: 3. S&B on the left, other two are both same case, but reloaded, both with bulged shoulder: 4. Three of the reloads (middle) with the two box rounds on either end: First thing I was going to try was to back off the seating die to reduce the crimp a bit, see if that fixes it, but wanted to see if anybody else has experienced this before and if so, is that what you did to solve it? Thanks!