Hi Ian
Do you polish your brass?
Are there any burrs inside the die, leaving marks on the brass?
What you describe can be caused by the above.
A way to lubricate the process would be lay the brass down on a cookie sheet and spray with case lube. Tumble in a plastic bag to spread the lube around and reload brass. After reloading, roll them around in a big old sweat shirt to remove excess lube.
I reloaded 9000+ bullets between Oct 07 and June 08, using this method.
Polish, lube, reload, wipe, shoot, repeat.