I think you will do fine with the TTSX. But here is another interesting option.
http://www.lehighdefense.com/collec...city-lead-free-bullet?variant=1073850700This may be better for coyotes and they may have a narrow velocity window to perform as designed 2000-4000 fps is what they state.
I have only just started playing with the 17 cal. version. It's explosive on milk jugs and very little chance of a ricochet. I would use them on a broadside shot for deer at moderate ranges. What happens when velocity drops below 2000 fps I don't know yet?
Another option may be Reloder 17 or 26 both are great in the 243 and R26 works well in the 25-06 but may or may not pan out for the Roberts.