The heavier bullets may expand less and actually cause less pelt damage if that's what you're after. I'd believe that pretty much anything in a 308 is gonna give 2 holes in a coyote - it's just a matter of how big the holes will be. If your reloading, you can slow any bullet down some too to reduce the wound size. Play with a few reloading manuals some (ex. - hodgdon.com)and a ballistic calculator (ex. - hornady.com) and you may find something as best as it can be for the 308. Maybe a lighter bullet at reduced velocities? I've used a 125 gr. in the 30-06 for groundhogs as it flies similar to my 165 gr. deer load in drop and wind drift, is a bit cheaper, and way easier on the shoulder than my deer loads in the summer with just a t-shirt on, and also reduces the chance of a ricochet. A slower bullet should blow up less than a fast one and a heavier bullet, or heavier constructed, should blow up less than a lighter varmint type. Now as to flatter-flying and beating the wind, you'll have to figure out what's best for your uses. JMHO.