RE: Savage model 10FP .223
Are you going to be hunting coyotes at night? If so, I'd go with no higher than a 3x magnification on the low side.
If not, something like a 4.5-14x40 would be more appropriate. I've got one on my .25-06 (Leupold VX-III), and I really like it.
I like the higher-end models of Leupolds, Nikons, and I liked the last Bushnell 3200 I looked through on a friend's rifle.