I hear ya loud & clear aalf. I'm not crazy about the big boomers anymore & powder is hard enough to find without burning 70-90 grains per shot.
Knowing my 260 makes the trip I might just buy some 150's to try in it. Or a 147 ELD. My chamber has a .175 freebore so I'm not likely to invade too much more capacity.
The MK is stated @ a .713 G1 & the ELD @ .697. Those numbers can buck wind with most, if I can get any decent velocity.
Since you are running the 150, how would feel about it @ 2800?
I know, I've got a lot of numbers to look at.
