I agree flatter trajectories are useful.
Not so long ago,range estimation was eyeball,or if you were a rare individual who understood the use,MilDot.
It was not so common for scope adjustments to be accurate and repeatable.
You might use up 40 rounds chasing zero around a sight in target.
In my experience,on the scopes of not-so-long ago,twisting knobs in the field was to be avoided.
And indeed,for most folks hunting out to 300 yards or so,maybe 400,trajectory and holds will work.Probably better than knob fiddling.
But you are talking 500.
IMO,at that point,you should have time to laser range,look at a range card,check the wind,and dial some clicks into quality optics adjustments.Then hold dead on.
There are a number of BDC scopes with ballistic cams that streamline the process.
Just verify where your rifle shoots.
FWIW,I studied the actual values of the Boone and Crockett Reticle.
Then I played with ballistic software to find a trajectory that matched.
I'm at Colorado altitude. I found the 30-338 launching a 200 gr Accubond at 2900 fps was a very good match,with the center crosshair zero'd at 300 yds.
The lower duplex tip was 600 yds. Windage value was 12 mph.
I built the rifle. 26 in Lilja bbl and a Leupold Vari-x 111 3.5-10 B+C.
Sighted 300,longest target at the range. Went on public land,lasered a 500 yd target. First round,cold barrel was a center X hit using the 500 yd hashmark.
Its not a 500 yd flat trajectory. It required compensation. I just made it easy.
If I increased altitude significantly,or any other change in environmental conditions,I'd have to compensate.
A few years back I took my brother with the AR-10 T pronghorn hunting.
He spotted his buck a long way off. He went crawling bush to bush through prickly pear a few hundred yards and ran out of bushes.
He lasered,checked wind with a Kestrel,did his calculations. Shot once,dead pronghorn. Heart/lung within 3 in of his aiming point. 563 yards. Its a 308.