9X was sorta marginal for a prairie dog at 400 yards, but to 300 yards I had no trouble with either a 2x7 or a 3x9 on the little critters.
I used a Simmons 44Mag 3x10 on my '06, shooting at a 22" steel plate at 500. I could hold one MOA and sometimes a bit less. IOW, for coyotes, 10X would be plenty at, say, 400 to maybe 500. Range estimation and wind get to be more important than magnification when you get past 300 yards.