Question about drop at distance

[Drifter]

Last time I was shooting longrange (for me) I was zero'd at 100 yards, shooting at 450 yards, factory hornady 123gr, comping 1.5 mils and right on target

3.6 X 1.5 = 5.4"

Multiply that by 4.5 (450 yards right?) and you have 24.3

Please correct my math if I'm being stupid here

So my 17" upper is only 24.3" low at 450 yards with a 100 yard zero??? hard to believe...

Yes, I verified the 100 yard zero first 3 shots of the range session. I was on level ground, equal with the target's elevation. No elevated scope base or anything. Musta fired 60 rounds that day and most of them were hits.

When I ran the Hornady 123gr factory load through the JBM Ballistics website, assuming a muzzle velocity ~2475 for your 17" barrel, the results at 450 yards (with 100-yard zero) were twice the numbers that you posted. Drop is calculated as 3.0 mils, or 48.8".

If you were using holdovers in your reticle, and holding on the 3rd line, perhaps each mark represents 1 mil and not 0.5 mil as you might be thinking?

Share more info about your scope, its reticle, its turrets, and whether you were holding over or dialing up, and maybe someone can help you figure it out.