I'll be real with you for a bit but learning how to do it with simple tools will get you farther towards successful calling . Spend the money on gas finding where coyotes are and getting permission to hunt them or just drive to Nevada with a guzzler map !!!
A closed reed call is easy to master quickly, the little Circe is a good choice. Open reeds take a bit longer but are very versatile and are not prone to freezing in cold weather like the closed reeds can. Call less by hand as they are looking for you when coming in. E callers are great and an...
It's all about the bullet. A properly twisted .224 barrel can deliver a properly constructed projectile and be very lethal to some pretty tough targets. Terminal performance is impressive even when motivated by the lowly 223 rem case. Scenarshooter knows of what he speaks....
You should have some life left in that barrel. Seating depth (chasing the lands) should be practiced as the throat erodes over time and round count. As mentioned above make sure your scope is properly vertical as this alone can cause long range shots to do what you described. The use of a bubble...