My displacement velocity concept has been widely accepted since I brought it out in 1990, and quite supprisingly, I have not had a single argument against it!! But I've had thousands of kill reports which agree with it.
I said all that to confirm exactly what you are saying. We don't need to load the big boomers heavy. Just load so MUZZLE VELOCITY calculates to produce around a 1.250 wound diameter, and enjoy shooting.
For example, I shot 5 deer in a row with a 44 WFN leaving the muzzle at 1200 fps. Two were spine hits, with one a quartering shot taking out 4 inches of bone. This at 100 yards, using only a 240 gr bullet, and the exit wound after 20 inches of penetration was one inch diameter. The other three were full sized whitetails hit through the ribs (lungs only on one) at from 50 to 100 yards. All five deer dropped in their tracks.
A heavier bullet holds velocity better at longer ranges, but more importantly with deeper penetration. So I lean toward heavier weights but not extreem weight, though I offer the most extreem weights available!
The message here is. Don't even think about impact velocity when using my DV formula. Just muzzle velocity and it works at pistol ranges to at least 200 yards. Everybody so far who has given reports does it this very relaxed way and it works!