After doing some very careful measuring and comparing my primed cases to some factory rounds, I have discovered that my primers may be seated a little crooked. That is, they stick out .001 to .002 on one side of the casing but are flush if I turn the casing 90 degrees and measure again. I am using a very good vernier dial caliper to measure with. The primer pockets were all very well cleaned with the Lee primer pocket tool so I don't see why this has happened. I put them on a flat surface to see if they rock a bit. Some do and some don't. Some of the factory rounds rock a bit too. Maybe I am being paranoid, being a first time reloader. I guess the only way to find out for sure if I have a problem will be to go to the range and see if I get a slam fire with the M4. Crap, I have read up on slam fires and it can be dangerous!!