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If you are firing those cartridges in just one rifle, neck size only during reloading.
Motor is spot on with his diagnosis.

I have found in general, the Remington brass is a bit on the thin side, and softer than most.
The soft brass allows more case stretching, leading to the case separations you are experiencing.

Take a paperclip, straighten it out, then bend a little L on the end.
Insert the tool into the fired cases, dragging the tip of the L along the case wall.
If there is case stretching, you will feel the tip getting caught in the thinned out ring on the case wall.

Gregg
 
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