FN FNC iron sight zero procedure?

[boofus]

I'm trying to figure out how to zero the iron sights on my FNC. The rear aperatures have 250m and 400m stamped on them. Surely there is a way to do a quick short range zero like for AR15s right? Like how you go -2 clicks from 3/8 and then zero at 25 yards and then go back up to 3/8 for a 300 yard battlesight zero?

I don't think any of the gun ranges here even have 250 meter targets. They all go in 100's.

Any other FNC owners have a good method for zeroing their irons?

 

[Pilgrim]

If it hits about 2 to 2.5" high at 100 yards with the 250 meter peep, you are in pretty good shape.

Pilgrim