Dirtfarmer,

With US869 I got 3300 fps with two Nosler 140-grain bullets, using 87-88 grains, and there's no major compression involved.

If I might ask, why are you so obsessed with not seating anything but the boattail below the case neck?

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck