Conventional wisdom says to full-length size for lever guns, pumps, and semi-autos. Some say that neck sizing only works for them. Others say that closely fitting the brass to the chamber and sizing only enough for reliable feeding works for them.
.30-30 brass is known for long life. I've got some that have probably been reloaded 10 times, and I can't ever remember throwing away a piece of .30-30 brass because of a split neck or incipient case separation.
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