My new Bushmaster DCM rifle came with a strange gridded target and some odd instructions for setting the 300m zero at 25m using this target.  I can't for the life of me figure out what they are trying to get me to do.

'Splain me, Lucy!  Can someone here tell me in plain english what it is I'm supposed to do with this thing?  The instructions mention a 300m mark on the elevation adjustment dial.  Got a dial, but nothing that indicates 300m.

Thanks for helping a complete AR newbie!

http://groups.msn.com/TheMarylandAR15ShootersSite/zeroingmethods.msnw?pgmarket=en-us
and
www.norma.cc/htm_files/javapageee.htm

I cut & pasted the norma.cc thing and it didn't work sorry. the maryland shooters thing gives more confusing info. I sighted @ 100yrds on the 2nd to last setting and havent realy used anything else.
I'm sure some poeple with more experience get chime in w/ some better info. I went a few pages back and saw the battlesight zero question.

All you need to know about sighting in is right here.

Improved Battlesight Zero