RE: 300 ultra , 300 win. or 7mm ultra ??
Don't know yet about shooting 900yds but what I can say what my GAP 300 wm tactical will do out to 700yds 80 deg,
100 yd zero
from 100 to 300 yd drop is 8 1/2 in
from 300 to 600 yd is 48 1/2 in
from 600 to 700 yd is 24 in (3 1/4" 5rd group at 700yd) TOTAL 79" drop
Black Hills 190gr BTHP
Rem 700 action
Mike Rock 1/10 26" barrel, #7 contour