to my way of thinking, your 243 is an ideal coyote
rifle. the wife and i do quite a lot of coyote calling
during fur season. we use 70 grain speers and they do us
a very good job. we have found that our 223's are some
what light at long range, but then a 12 gauge is more than
enough for close range. careful about getting into the
coyote hunting, as it is extremely addicting. good luck