Ahhh that makes sense. I didn't consider the chamber and was only thinking of the case itself as the 'volume' under consideration.
Thank you!
Yeah, your case volume starts to increase the moment the bullet starts to move forward. This is why MD's suggestion is the most simplified, boiled-down way to approach seating depth- start at the depth that produces the highest pressure, work up your powder charge to wherever you want it, and if accuracy isn't there, work seating depth backwards, going deeper and deeper, until you find the accuracy you're looking for, since pressures will only get lower and lower (until you've got the powder column packed with a fair bit of compression) as you go. Seems I've heard this before..."kiss, find pressure, and rock on"
