- Mar 30, 2013
I've used both 7977 and 8133 in my 2 7mm LRMs. The 7977 always needs grain-ish more to match velocities with H1000, but shoots very good. I tried the 8133 in my 6.5 PRC and couldn't get the velocity up to H1000 before running out comfortable room in the case. Then I tried it in my LRMs and it shows promise, it really fills the case well so it has good uniform ignitions no matter the rifle angle. I'm still working the load up with it. It should do well with the big case capacity of the Nosler. I'd try both powders if I were you.Hmmmm... they really loved 7977. In fact it's shaded sd THE best powder threu tested and I didn't see it right away. I think US869 is Unicorn Dust in today's market. I'll look but I'm working on getting that 8133.
Something I've noticed on these new IMR powders in my barrels is they clean out really fast and don't seem to be holding as much copper. But maybe that's just my case.