Don't forget the tumbler to polish brass. I have an Lyman. They all work fine. Use ground walnut instead of corn cob. It works a lot better. I have a 550B. Take your time and read the Dillon manual step by step. It's a good press. One thing to do is check the powder charge several times after each adjustment to make sure it's consistant and correct. I always start a little heavy and turn the cap screw in to make sure the threads are back seated. Your dealing with so little powder, the clearance in the threads will vary the powder by .1 grain.
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..........