why the massive improvement in velocity?

Yes Gary, unless your going to be using bench rest quality bullets and dies then the exact position of the ogive where it contacts the lead will vary by a surprising amount. This can and probably will lead to varying pressures and the resulting varying precision on target. Personally I would start seated in an work out. You of course can make up your own mind on which way is best. Good luck with your new project ;).
 
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