I have a question please.

I have a sfp scope and it is zeroed to 40 yds if I shoot at 30yds or 50yds I need to take into account mil Dots up or down to be on target.

If I get a FFP scope will I still need to do the same mildot adjustment to be on target or will it be on target if I zoom in at 50 and zoom out at 30??

Is it just the recital that changes??