The Dillon comes with a large and small powder chamber. The lowest charge I've used has been 3.1 grains of W231. And I've got to say that it has never waivered off of 3.1, or any pistol load. I now check every 20th round and randomly for QC reasons, and found it was always 3.1.
There are three kinds of men:
1) The ones that learn by reading.
2) The few who learn by observation.
3) The rest of them have to pee on the electric fence and find out for themselves..........