I had some 142 gr NABLR's that I use in my 264 WM. Loaded up some with IMR4350 at 45.5 gr. 4 shot group measured .330 @ 100 yards.
I'll load up some more and run them over the magnetospeed and see what they're doing.
Regardless, I'd say I found a load that should work.
Here's the picture.