I hope I'm not to blame for all this discontent. I think it should be a given that if you seat the bullet deeper then it will decrease the case volume which will increase the pressure. The fact that seating depth isn't widely published data kind of eludes me. However, the fact that people aren't blowing themselves up seems to indicate that it isn't quite the big deal that I think it may be. Either way, this is part of the reason (IMHO) that we are routinely told to back off ten percent and not all load data is safe or intended for all guns.
Personally, I have found this whole conversation interesting. I love the old manual in the pic.
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