.204 Serria bullets to soft for coyote

[GP]

A coyote run out in the crested wheat grass at 274 yds and all I could see was the top of his head. I shot him with a 39 blitz. and it took half his head off. DOA. I have tried a lot of 204 bullets and 39 blitz. and 35 Bergers work the best for me. Idaho coyotes are relatively small though. I use H4895 powder.