Does the diameter of your primer pockets seem to be too small, or can you not seat the primers deep enough? Either way, there are simple hand tools available from most reloading companies that will address the problem. You'll need either a swager or reamer to correct the diameter or depth.
There have been several comparisons I've read over the years on primer size. The CCI's have ALWAYS been a little larger diameter than the others.
If your .204 brass is on the slightly "tight" side of the spec, there you have it.
Several reloaders I know reload brass so much, that towards the end of it's life when pockets get expanded slightly; they switch to CCI primers.
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