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The neck tension is created in the sizing die, not in the crimp. The crimp ADDS resistance to the bullet leaving the case, either during firing or as bullet pull when another chamber is bing fired. Without proper case tension prior to the crimp the loads never will work well.
Your sizing die, is it screwed ALL the way down where it contacts the shell holder? This is especially important if it isn't a carbide die. If it is adjusted right have you tried some other brass? Thin brass will do what you are seeing too. How old is the die set? If the die set is pretty old it might be set up for .454" bullets, and would act like what you are seeing. What is the ID of the sized case?
This is usually pretty simple to get through with a little Q&A.
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