If you can shoot the 75 grain Hornady you can shoot the 77 grain Sierra. The Hornady bullet is longer. If you don't believe it, measure them.
For your application though, you will love the 55 grain Nosler Ballistic Tip.
If your shots will be under 150 yards the Sierra 55 grain HPBT will shoot good with just about any rifle and any powder.
I am an avid Coyote hunter too. In my long gun (5.56 chamber) I use 55gr Nosler BT's @ 26.7 grains of W748, Fed Premium cases and WSR @ 3100 fps. It shoots .4 - .6 inch 5 shot groups, day in and day out. There is a wide range at the top for W748. Start around 26.0, and go up in .1 increments until you find pressure. If you have a .223 chamber start much lower.
In my 16 inch gun i use the Sierra 55gr HPBT's with 26.1 grains of H4895, Lake City Nato cases, CCI #41 @ 3010fps. You can dang near get NATO velocities from H4895. Again.. There is a very wide range of good accuracy at the top. 25.3 - 26.1. That rifle shoots that load with regular consistency at .6 - .7. inch 5 shot groups.
Happy hunting buddy.
