Reloading .300 Win Mag (I can spin the bullet in the case after seating, how do I correct this?)

[USMC88-93]

.300 Win Mag
New never fired Remington brass
Lee Deluxe die set. (Used the full length re-sizer and not the neck sizer die as these are new cases)
RCBS Rock Chucker Supreme press.
Barnes 150gr TTSX
Primed the cases on the press.

When I seat the bullet I can both spin the bullet within the case and with a little pressure can push the bullet in (only within the first groove in the bullet).

Used a Lee Factory crimp die to crimp and when I crimp fully the round will not spin but it leaves me with what appears to be an excessive crimp mark. (Not enough experience there to judge however)

I thought the neck tension of the case without the crimp shouldn't allow me to move the bullet without excessive force.

Would there be some mistake in the set up of the re-sizer die that would cause this or is some movement of the bullet normal til crimped

These are my first "unsupervised" rounds (no external help from knowledgeable friends) and I am slightly concerned that I missed something that caused it.

I do not have a micrometer to check the size of the expander ball on the Lee dies but elsewhere was told that this was a likely cause. So I will have to scrounge up a micrometer or go buy one to check this possibility.