My Dad was a fan of IMR-4064, so that is what we used in our '06s. We used 52.0 gr with 150 gr Sierras ( a load I still use) and, I believe, 55.0 gr with 125 gr Sierras. (Please verify that, as I am not at home with my notes!)
We would jump the jackrabbit and try to get into a sitting position and wait for the jack to stop about 100-125 yards away. Nowadays, they don't seem to stop - natural selection at work, I guess.
