Originally Posted by trueblue
Based on Quikload:
H1000 65.12gr- @ 62366psi= 2879fps
Retumbo 68.1gr @ 62399psi= 2941fps
Looks like Retumbo gives you 60fps more, but you will have to determine what your most accurate load is.
Both powders are temp sensitive.
Retumbo is one of my favorite powders, have used it in 25-06, 7 STW , 6.5-06AI, 300 WM.
I have a stack of H1000 for my Edge but no Retumbo so I might try and pick up some tomorrow. I thought Retumbo would give higher velocities as I have tested up to 67 grains of H1000 today and there is still plenty of room in the case. Just getting pressure signs at 67gn.
I have not chronographed or tried for accuracy yet, just banged off a few shots out the back door of the shed to check for pressure and run the barrel in a bit.
Hope to try Retumbo if I can get some.