I'm pretty new to predator hunting but am shooting a TC Encore with a heavy .223 barrel. A couple weeks ago I shot a female coyote at 305 yards off my back deck. Shot through the motor and she dropped where she stood. Moments later a big male came out across the field from her final resting place. I shot him at 275 yards but evidently hit him either high or far back. He went right down but dragged himself back up and limped away. A second shot missed. My tracking the next morning revealed a likely scenario of complete pass-through and failure to anchor him. I've been shooting 55 FMJ and am convinced that, while they're cheap and shoot well for me, they are not the ideal round for varmints. I want a bit more expansion with more retained energy so I don't have them run off wounded. Looking forward to other replies to this thread.