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"there have been some pressure jumps...I'd guess that jump signifies where the bullet makes it to .338" in the chamber mouth and then runs into the .310" (on mine) barrel"

Is the pressure jump something you feel in your hand? I'm not familiar with the term.
 

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Ribbon, thanks for the illustration, but do you actually understand what happens there? What are the bullet diameters? What powder(s)? What is your explanation?

I'm going to try out some of this type of experimenting.

I am getting about mid 500s fps with 3.1 gr W231 powder and flush loaded 83gr plated HBWC in a resized .32-20 brass, and I get mid 600s fps in the commecially loaded Fiocchi 7.62 Nagant (longer case).
 
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