Bob seems the top end is about 3250 with 160 AB's and Retumbo;over 3200 with RL25 and H1000.
We can see little difference we can detect with regard to pressures, etc., with the 160AB, Partition,or Bitterroot.IIRC my pal has also run some 160 gr Northforks....about the same/same across the board.
The cartridge is pretty predictable in terms of where we wind up velocity wise.
I have had only one screw up, that with a 160 AB and Retumbo that registered 3330...I got a bit heavy handed with the Retumbo.I never fired another round of that load.
