To illustrate the problem I've just photographed the difference in primer seating.
Same batch of primers, I find about 2/3rds are OK and the other 1/3rd sit just proud. All were Remington 209's.
"fat" rim primer sitting proud : http://i633.photobucket.com/albums/u...ps77bbb929.jpg
"thin" primer sitting flush : http://i633.photobucket.com/albums/u...ps0c49d4bc.jpg
Yes, that's enough to make the cylinder bind. The "fat" primers work great in my Remington 1858 nitro conversion though so they still get used.
NSRA and NRA qualified RCO.