I think H1000 can be found on the shelf right next to hens teeth.Extremely hard to find right now but H1000 and Retumbo have always been top performers for me in the 6.5-284. I recently found a pound of N560 to try and it shot decent but never really tightened up for me at any charge weight with 140 Bergers.
I read some older posts of folks running 52-52.2gr of RL22, both with and without success.