Hey marine guy,
I bought both the 35mm and 25mm hogsters. I decided to measure an average ND coyote and make tinfoil silhouettes. Our coyotes are roughly two feet long (chest to butt) and two feet tall (top of head to the toes). Seven inches wide (left side of chest to the right side). Nine inches from the top of chest to the bottom. I made a few silhouettes, but the main two were 7" x 24" (front view of coyote standing) and 9" x 24" (broadside body cavity).
I placed these silhouettes at 10,200,300 yards at our local gun range. I used the first set of crosshairs on the hogster, the one that looks like a "T". With a rock solid rest, I placed the bottom bar at the bottom of the tinfoil and measured how many "plus signs" to the top of the tinfoil of the 7 x24 silhouette. The 9 x 24 silhouette, I used the thin horizontal bar and measured how many "+" to the other side of the silhouette.
25mm: 100 yards its two "+", 200 yards its one "+", 300 yards its .7 "+".
35mm: 100 yards is 3 +'s, 200 yards its 1.5 +'s, 300 yards its 1 +'s.
Whenever I tried this ranging method and verified it with my onX app, I'm usually within +/- 25 yards.
If you're using an ar15 that shoots 50-55 grain bullets, sight it in at 1.5 inches high at 100, you should be dead on at 200, and eight inches low at 300.
Hopefully this helps.