I shot two deer this year with my .243 win loaded up with 44 gr. varget pdr. and 80 gr. sierra SBT's @ at 3,410 fps almost same bullet, very accurate, bit light for deer honustly, but one of the two deer I shot was a big 4x4 mule deer in Idaho at about 190# or so and at 150 yards, bullet mushroomed on the opposite side of rib cage but did the job, the 85 gr game king should be just totally perfect, not too much and not too little expansion/penetration.
I love the 6mm's, I Personaly am probley gana switch next year to a swift 90 gr. scirro 2 bullet, or a 85 gr. barnes tsx. The 80 sbt's mushroomed and exploded a little too fast. I shot a blacktail in oregon and only had a rear quarter shot and took it and I chased that buck for 300 yards before I could finish him off, lol with his intestens draging the ground and every thing, he didnt want to get tagged and bagged. First time and last time ill rear quarter shoot a deer with a .243 win. Ive done it many times with 7mm rem mag and 30:06 and deer dont go any where. But yes I would say the 85 gr. game king should be fine for deer but maybe a little heavy on a yote, unless your pumping some serious velocity to make it open up fast enough on a little tiny 35 pound coyote. I prefer the 65 gr. rounds for yotes, much more killing power on yotes.