Rufous, a 334 bushing should be ok if the loaded rd is 336.
I usually use a bushing 2k under loaded size.
I do not use the expander ball cause most of the time
it will not expand the neck if any because
it's not been sized down as far as a reg die will size it.
Make sure the case mouths are chamfered.
Also if you have shot the brass several times
the necks could be getting work hardened.
Annealing the necks works wonders.
Hope this was a help.
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