Just the other day I was working on a load and changed bullets, I thought I had the same .010 off my lands. Got to the range, chambered one and it cammed in tight, I figured better check it, the bullet stuck in the barrel and powder came out my action. Lesson learned, sacrafice an empty brass as a master case to try at home before you load 20 pieces.
Sometimes I have a shakey hand, I once bumped my beam scale while removing the pan and moved my 1 grain weight over a notch. Always double check your settings while you are working.
I have an uneven bench surface, if I slide my scale around I loose my zero, by as much as 3 tenths. Something to keep in mind for those of us who dont have lazer straight and level workspace. Now when in use the scale goes left of the press 8 inches and centre on the bench for consistency from session to session, and to prevent any mishaps I secure it with painters tape and check zero every 20 or so loads.
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