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You'll find that you probably will have to trim those cases as fired, before you size them. The carbide sizer brings them down VERY small. The next step would be to re-expand and bell them before bullet seating, but if you've already done that and they're still too small, then try slipping some fired and unsized cases over the trim mandrel. They should fit.
(Bottlenecked cases, OTH, are always trimmed after sizing, because the expander ball in those dies does bring the neck back to the correct size for the trim mandrel.)
You may find, after all this, that you seldom or never need to trim any straight-sided case, including the .30 Carbine. They just don't grow like a bottleneck case does.
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