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· Premium Member
3,367 Posts
I'm wondering if perhaps instead of the issue being with the case neck tension, if it could be inconsistentcy of how the bullet aligns with the seating punch in your loading dies?  Are you using an unmodified RCBS nose punch?  

Try using your calipers on a few loads prior to crimping with the Lee Factory Crimp Die, and see if there is any variation before crimping.  

I'll bet that a switch to a generic type pure flat bullet seating punch would cure the problem.

Let us know what you find!

God Bless,

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