You have to shoot it at those ranges - every 40 to 60 yards will tell you want you need to know.
The 53" drop figure was not actually correct as to what a person would see, as it did not use a
zero'd range at a starting point, but simply the actual drop from the muzzle.
With express sights, the bottom of the valley is the zero'd range, while holding level with the 'wings'
gives another 25 to 50 yards, depending on the calibre and load.
They are easy to use - BUT - you have to actually go out and practice. Someone who doesn't shoot
much past 25 or 50 yards who thinks of shooting 200yards- why that's simply out of the question.
For someone who actually shoots at the longer ranges, indeed, to 300yards WITH A ROUND BALL GUN,
200yards is not outrageous. I likely wouldn't do it, BUT- could if I needed to make meat.
That was the initial question by the OP, however to ask such a question, perhaps shows that person
shouldn't do it- without the appropriate bore, ball weight and charge & practice.
From a 100yard zero, with a velocity of 1,500fps, the actual chart I have, shows 29" drop at 200yards,
from a 100yard zero.
I also have 150 yard leaf sight - from there, it's a 15.6" drop.
I also have a 200yard leaf, so zero'd at 200yards.
Even with the 100yard leaf, holding 1/2 the elk's body height above the elk, would give a centre hit.
Like I said, one must practice.