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Finally !

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Are you getting consistent lengths having to back off and re try during seating?

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I still find it kinda incredible you have that much neck tension you can collapse the case dirty or not.

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Bronse bore brush in a drill up the necks

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So have you trimmed all your brass to the same length and set your die properly yet?

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http://leeprecision.com/cgi-data/instruct/RM3508.pdf

I give up

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This sounds like the neck touching the crimp part of the die to me as in my other post .

The die is trying to crimp the case mouth into a canalure on the projectile that isn't there and you are...

Seating die set too low or brass needs trimming.
Trim all brass to same length put one in shell holder put ram right up. Wind die down till it touches neck and wind back up half a turn. Lock it and...