It might be interesting to have a few more people measure their CCI small rifle primers and post here. If your measurements are outside of what is expected from CCI, you may well have grounds for returning them, even if within SAAMI spec (which seems very broad).

I only use large rifle primers sadly - but out of interest I measured 3 random ones and they are all identical - 5.34mm x 3.17mm

I've never had a problem seating them in either PPU or Hornady brass. I have read about people with loose primer pockets using different slightly larger primers which were then able to seat much more firmly. Probably good for economy, but not ultimate accuracy.