You can't. Optimistic loads with 140s are 3200-3250.
Kind of what I was thinking.
I don't shoot 140gr bullets as the 160gr PPSN at 3261fps will kill any game including Moose. That is the 3 Shot Average through the Chronograph. I am sure I can exceed that with the 140gr bullets if I wanted to shoot them. I do shoot the 130gr JLK VLD bullets and have not pushed them as fast as I can and am over 3200fps with them. Right now I am working on my 338 Federal to try to reach 3000fps with the Barnes 160gr TTSX From my DPMS LR338. That will be faster than the 160gr Barnes 7mm data. Yes it will slow down faster than the 7mm but then I will be using it for 400yards or less.
