As Jelly has mentioned, Sharpe's book is a bit outdated as far as data is concerned. But, there is other information in there that is timeless, this seating depth/OAL issue is one of them.
I don't know too much but, I have learned over the course of my 56 years to listen to those that have been where I want to go. Reloading is like that for me....Those folks are the "been there done that" crowd.
Elmer designed his bullets with seating depth in mind. More of the bullet outside the case is a good thing when wanting more from a revolver. The only limiting factor is OAL in regards to how it fits in comparison to the length of the cylinder.
FWIW
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