For the 270 gr bullets, 4064 is excellent. I have a couple of rifles with the G&H sidemount and Lyman or Leupold Alaskan.
With a Lyman 48, a slight head movement lines that sight up. It was popular in the early 50s-ahead of its time. My 1951 M-70 375
is ready for a return to Alaska. Have homestead land in the interior.

But for trail walking or fishing, a pre-war Model 71 in 450 Alaskan is the only way to go. Big bears require fast repeat shots.
That's why the 86/71s make their last stand in Canada/Alaska.

Hope you get that Model 70.