jlanecr500":8vxmg1wo said:
In the 4350/rl17 burn rate family you should also try rl16. In our testing it has been very temp stable with a velocity spread of only 30fps from 30 to 90 degrees. I traced it in warm weather and will be tracing it again soon. I have strain gages on .308, 30-06, 300wm, .338wm, and .408 calibers that I will be pressure testing this year.
I've also found RL16 to be very temp stable.
However, for 180gr bullets in a 30-06 and the fact that RL16 is not very dense (and even less so than H4350), the OP would most likely not achieve the velocity he's after due to case capacity.
RL22 has long been an excellent powder for the heavies in 30-06 but I haven't found it very temp stable. RL26 is an improvement in both load density and temp stability, so I'm not surprised by the results he has achieved. In temp stability testing, I have found RL26 averages ~0.4-0.6 fps per 1°.