The OP is Elk/Moose - significantly heavier than even a heavy Whitetail or Mulie Deer.
My 8x57 is a Persian Carbine w/18"barrel+/- all velocities are over Chrony at 15ft from muzzle.
My first Bull elk dropped to a 175gr Sierra (2700fps) at 75yards (near Willow Creek, South Pass, Wy - by the powerline). Bullet found under hide on offside, after plowing through both shoulders of the smallish 4-point - 139gr left intact.
My next Bull was 200yards or so at quite an angle downhill (Monument Ridge, Bondurant, Wy - below the fire tower near the beaver pond). The nice 5-point took a 200gr Nosler Partition (2400fps) on the dead run and plowed a furrow with his nose. Again through the shoulders and on through.
A memorable Elk hunt with my Dad in the Jack Morrow hills near South Pass, WY. A 200gr Nosler Partition (2400fps) entered an inch below the tailbone and an inch right. It was found in the right shoulder, nicely mushroomed. Happened to have my survey gear with me - distance 265yards slightly sloping downhill. Not sure if I'd taken that shot with the 175gr Sierra. Something about confidence that I had gained with the 200gr Nosler Partition. Carved the meat right up to the wound channel. I thought there would be more loss.
Another elk was shot above Fall Creek, Boulder, Wy. This time with a WW cast bullet. 183grFPGC at 2230fps.
Not sure what your beef is with the trajectory of the 8x57? There is nothing wrong with 2400fps and that 200gr Nosler (BTW - the 200gr Nosler is faster than the 185gr Remington Coreloks with the same powder charge - yeah, I didn't believe the Chrony either, until I fired the next string!) I do happen to like the 185gr Rem, just have not shot anything bigger than a Whitetail with it. I did get a load with H4895 that tripped the Chrony at 2550fps with the 185 Remingtons, and they are cheap! The 175gr Sierras are the speed demons at 2700fps. The 150gr Sierras/Hornadys only gain another 100fps.
Know your rifle, set the sights appropriately, and go hunting. The 8x57 will get it done!
Regards,
Sweetwater