I finally used up my supply of old factory Federal "High Energy" 140 gr. TBBCs that chrono'ed 3,078-3,102 fps in my 24" model 70. I've had great success with these on all kinds of big game.
Would you have any suggestions on how to replicate 3,100-ish fps with Northfork 140gr or 140gr TSX? If so, what velocities, bullet, which powders?
I've tried H4350 up to 54.0 gr with the TSX but only get around 2955fps; with no obvious signs of pressure. This is the max listed in the Barnes reloading manual. Barnes is able to get 3,030fps.
I have a longer barrel than you have, but I got 3140 FPS with 140 TSX with the 63 grain H-1000 load that I posted above.
Your rifle may or may not get close to the speed that mine rifle got, all you can do is give it a try.
