Over the last 20 yrs I've been shooting among high priced horses at p/dog's a lot.
Sure can't have any richochette's.
Since I use only a .223 and just recently got into NEF's in the little .17's I'll be giving those a try since they are ideal for my situation.
Need a little more info from you now.
Do you reload? have access to someone that does??
I went to 40gr plastic tips that explode on contact, and it don't need much contact either. I've had less than five feet of dried small sunflower stalks eat 40gr V Max's. The proof was in the fresh snow and hole's in the stems. Plus, a total lack of cut fur and blood from a coyote standing among them at 120yds. I'm convinced about that now.
Couple things here too. We save the fur so exit's matter a lot. 55gr sp's will exit and blow quite a hole out the back side. Those 40gr do NOT exit at all, or haven't yet on over two hundred coyotes. From 20 feet clear out to 400yds. They kill on contact too. I like to see them drop at the shot.
Going with the NEF will help you finance a better glass, more shooting, more calls, camo etc. and you can get another barrel pretty cheap to change calibers too.
IF you have many good shots under 175yds, I'd suggest you consider a HMR. They won't richochette either. But, you'll have to make certain of your shots going to the front lung area.
Be safe is the only thing that really counts, all the rest is fun. Take careful aim and nail 'em.
George