What you did, or did not do, is for you to clearly explain.
I imagine you can re-zero your rifle during your next visit to the rifle range.
Pick one zeroing method. Please don't mix methods.
The real truth is at 300 meters. If you have access to a range with a 300 yard or 300 meter line, you could use it to verify your rifle is zeroed properly. Some fine tuning may be required.
Record the direction and speed of the wind. The effects of the wind may not show up at close range, but will have more opportunity to affect a bullet enroute to distant targets. Again, fine tuning may be required and will vary according to the direction and speed of the wind.
Shooting a 1 inch diameter group at 25 yards should be good enough to keep you on the paper of the targets. A battle-sight zero is supposed to allow you to engage targets of a certain size from 0 - 300 meters without having to adjust the elevation wheel of the rear sight assembly. You might hit slightly above or below the center of the circle but, in theory, you'll still hit the circle.
Congratulations on the purchase of your new rifle. I wish you success in learning to master it.
~Craig