FWB FWB300S curious question

Today I had a chance to setup and shoot a new to me 10 meter FWB 300 S. Tyrolene.
I installed an inexpensive Discovery 3-12 scope on it.
I was shooting JSB 8.44’s. @ approx 560 FPS.
Although a 10 meter gun, I zeroed it at 25 yards.
What surprised me was when I returned my target to 10 meters it was still hitting my bullseye or zero???
normally when I zero a gun at 25 yards and then shoot at a 10 meter target it will be aprox 2” low depending on my scope height.
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any thoughts on why the two intersecting points had the same zero @ 10-25 yards??
 
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A quick ChairGun says yes, your near and far zeros will be 10m and 25y.

I’ll bet it’s a sweet shooter.

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It's not flat. It's the 2 intersecting points ie, line of sight. My 300s that is a bit faster than yours with the scope mounted pretty high intersects within .25 inches at 12 and17 yards. Perfect for where most of my backyard pesting takes place. Sometimes a guy gets lucky.
Yes yes yes …. Know this
Didn’t realize the ballistic / trajectory path as I generally only shoot 700 FPS and above