You asked a few questions there.
First the difference between data.
Hodgdon's data is more current than any other manual. When was the data in your book tested, and by whom? Likely they won't say, but was gathered from some source in the past. Further speaks to normal lot variations and why no one should be assuming all powder is the same, it's not!
If your load is accurate, how could you possibly be selling yourself short?!
No one ever remembered how fast a load was when the shooter can't hit the broad side of a barn. But everyone remembers the old fool who can hit anything he sees, at stupid slow velocities. There is a good lesson in that.
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