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I agree with Robert, you need at least 3. When ever I change a load, or when ever I set up a new caliber on the bench I always check things out. Here is my procedure when I change (lets just say it is due to a "learning" experience):
1)Weight the bullet in question (check it really is what the box is labeled)
2) Check my notes for the planned load and write up my load label
3) Check Seirra's manual and make sure my load label is in spec
4) Check Speer's manual and make sure I am in spec
5) Check Hornady's manual and make sure I am in spec
6) Check the specific powder company's manual and make sure I am in spec.
7) Finally make the first round, check for feeding and again check powder scale, COL and bullet weight.
8) Make the production run of rounds
9) Log the production run into my notes.
10) (fun part) shoot the load, note results
I know it sounds complex, but this system has kept me out of trouble for years, and it builds a lot of confidence in my production techniques.
Good luck.
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