That advice about the 223 and the 40 gr Nosler Ballistic Tips is solid. Over the last 5 or 6 years of being retired, I've shot coyotes with my 260 (100 gr BT's) and my 220 Swift (55 gr BT's), but the 223 with those 40 grainers put coyotes down so fast that I was shocked. All I can figure is that the bullet dumps all or most all of its energy in the coyote, rather than the dirt field on the other side of the coyote.