The screenshot I attached is my take on the G36 reticle for 3x mag. The methods I used to draw it got me 22px between the 200m stadia lines in that screenshot. Yours has 25px.
In another post I explained about the Training Target #1, the tall one. Copy-pasted from my notes:
05:02 11.05.2022
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Training Target 1 (tall target, type_id 2151):
The 'head' is 30976 med units (47.27cm, 18.6") wide.
From top of the sandbags to top of the 'head' = [1][47872] (1.73m)
From the notch in the top of the sandbags to top of the 'head' = [1][53404] (1.81m)
So that's the item I use in my test range maps to check rangefinders and BDC hashes. My latest 5x ACOG chevron is just a tiny bit wider than the 'head' of the target at 300m. All the hashes on it seem wide-ish, but the resolution is not friendly to the artwork, you know?
I redid the ballistics, too. I got bits of this from two sources, but I googled up a 54.2" drop on a 5.56mm round at 500 yds. with a muzzle velocity of 3060 fps. So I set a steam grate on my range 457.2m from and tipped to face the firing position, then put a target #1 behind and flush with the steam grate, centered that 1.38m from the top of the target, and after setting the weapon.def and ammo.def to lab conditions, bullet velocity of 933, I tweaked the drag a bit, and a value of 0.5 put a round aimed boresight at the top of the target dead center on that steam grate.
I can work with that.
A few experiments later, I had the BDC you see on that ACOG reticle, though I had to reduce the velocity to 788m/s so I could get some space between the hashes. Wikipedia says the HK416 with a 10.4" barrel does that.
And that G36 reticle in my screenshot, the center cross is the 200m aimpoint. Set the inner edge of the ring on a helmet 400m away, that's a headshot. The 600m and 800m crosses are headshot accurate under lab conditions, but you'll hit a dude at those ranges in game, easy. You do have to hit them a few times before they go down, but you can hit them.
So I think your stadia could use a bit of work, maybe.