Sorry to hear of your troubles xausa. Indeed I asked about dimensional differences b/t Kynoch/Kynamco and other factory cartridges in the 404J and received a lot of great information. Here is the thread over on AR
http://forums.accuratereloading.com/eve/forums/a/tpc/f/4711043/m/9461097561

See also:
http://forums.accuratereloading.com/eve/forums/a/tpc/f/4711043/m/4411038851?r=4411038851#4411038851
The link to the second thread is embedded in the first, but wanted to make sure you saw it.

Hope you can get it sorted,
Bill