Everybody's opinion has some merit in a discussion. If you are looking for a definitive answer to the pressure/recoil debate you might try Tom Roster a ballistics engineer with more shotshell experience than anyone I know. I don't know his contact info but it should be available with a google.
As an aside, I am a bit perplexed with your statement regarding the need to get a new manual. As an IT person surely you know that all of the powder manufacturers have web sites with current load data.
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