John Barsness did a write up on just this a while back. I think he said that generally speaking, 2800 to maybe 2850 was top end for 140s in a 22" bbl. @2700 for 150s, and 2600 for 160s. That's off memory, and I could be off.
My father used to run 140 Partitions in my brother's Ruger M77 7x57, at 3000fps. I can't recall the exact powder charge, but want to say 48 or 49 grains of H4350. I know it made a crunching sound when he seated the bullet.
