greydog,
I've seen the same thing with "match"/standard primers more than occasionally.
Also, Federal 205M's are a relatively mild primer. They work well with the small-granule extruded powders favored by short-range benchrest shooters, but with spherical powders (and some extruded powders) they don't work so well. In fact, in an extensive test I did in the .22 Hornet, 205M's produced the worst results with Li'l Gun, while CCI 450's worked best.
