Hi Gringo,
I don’t want to bug you too much with this, because i respect you’re own personal experience, and i do agree about the 150fps. But for most people it’s the difference between the 308/30-06 and they bash the 308 for the lack of (power) Witch I don’t really understand myself??
Make a long story short: Look the manual SPEER reloading manual #13 , page 227.
7mm-08 with a 145 gr, IMR-4350, 48.0gr = 2841 fps
That’s why i figured with my 139 i would be able to go at 48.6 48.7gr.
Some of my Lapua ( 308 ) FL case are at 8-9 reload and there still fine.
What i did, i bought a box of good factory 140gr, and i chronied them. With a speed of exactly 2800 fps in my featherweight.
I didn’t want to go faster than factory ammunition, but at least reproduce the same (Level) of ammunition.
My 0.02 $