[kraigwy]

Try coming up 13 MOA from your 100 yard zero to 500

These are 1 moa clicks

100-200 2 clicks
200-300 3
300-400 4
400-500 4
500-600 4
600-700 5
700-800 6
800-900 6
900-1000 7
1000-1100 7
1100-1200 8

If you wanted to do the math: A MOA is 1.047, at 500 yards it would be 5 X 1.047 = 5.235 then divide your 72.8 by 5.235 = 13.9 clicks,

You should use 14 MOA Clicks

The Chart I posted above is for most 308/30-06 rounds.