If you have other brands of shellholders, then try those. Lee makes fewer shellholder sizes, for example Lee 9mm and 40 SW both use the same Lee shellholder. There is wobble with the 9mm brass.
Out of round is the most likely scenario. OOR will be visible to the naked eye.
If you have bent brass, then running it through an expander die, may be effective.
If you have brass that was walked on and flattened, then toss them. The fix is only to get them to enter the sizing die, by rounding the case mouth.