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Not sure why you're having problems and really not sure why the .270 expander is involved at all....this is a .308.
The only thing I can think of is that you must be annealling the case necks prior to the sizing and that is something you don't want to do when you are making a big change in dimensions. I find that running the .223 cases into my trim die (CH4D) and then into the full length sizer die with the .308 expander works great. I've never crushed a case neck that way. Sometimes I trim the cases prior to running them into the trim die, sometimes I actually use the trim die to trim. I did have a lot of problems trying to neck up .221 fireball cases and I did crush a few necks and split a couple too before going to the much easier to work with .223.
Hope something here helps out.
Frank
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