I loaded up 20 rounds for one of my Swiss K-31's this past weekend using Privi Partizan brass, IMR 4895 powder and WLR primers. Of the 20, 2 failed to fire until I slammed them home with a bit of force. The 2 that didn't fire had only very light impressions from the firing pin on the primer (until I slammed the bolt closed). The rounds seemed to fit in the chamber with no problems, including the 2 that didn't fire. The only thing I did different with these reloads was I tried partial resizing (using a full length sizing die but only resizing the neck down to the shoulder and not bumping the shoulder back any) instead of the normal full length resizing that I tend to do with Swiss rounds. All of this brass was once fired in the same gun I was shooting the reloads. Any ideas as to what may have caused these two rounds not to fire?