1) Have you checked head space on your rifle?( it could be set too short.)
2) Do you have a way to measure the base to shoulder length of your fired then after sized brass to make a comparison? (in some instances the shoulder to base dimension actually grows right before the shoulder gets bumped depending on the differences of your die and chamber)
3) You are right about anealing. Spring back not only gaurantees inconsistency in sizing it also creates variables in neck tension. IMHO a die that is honed or reamed for minimum sizing on the neck is optimal while coninuing to use the expander ball is ideal most of the time.
4) The information in the previous three points may provide an oportunity to make the proper adjustments in your process or rifle.
5) If all is well with the above, then a conversation with Forster would be a good idea.
What press are you using?
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