Either of those bullets will expand at the lower impact velocities on game the size of coons, and groundhogs or bigger. Personally though, for coyotes, I don't think they're the best choice. I'd use 125g, or 140g XTP-HPs myself. The 140g XTP's are hands down the most consistantly accurate bullet I've ever seen. They also can be very destructive at high end revolver velocities or rifle velocities. The 125g XTP-HPs are absolutely brutal on varmints at nearly any impact velocity, and have also proven very accurate in a wide range of 357/38 loads for me, and others I've loaded for.
If you'll work up a load with the 125g XTP-HPs running around 1400+ fps in that revolver, it'll likely give you(depending on the powder) around 1600-1900 fps in your rifle. It'll be impressive to say the least on varmints of any size, and will have very light recoil to boot.
The Remington "Golden Sabre" .357 bullets are designed for two different velocity ranges(357 magnum, and 38 special). These bullets are extremely explosive, but have given me less than decent accuracy in several different guns.
Last, but not least, the 125g, and 140g Remington bulk HP's are pretty daggone accurate, and expand very nicely at impact velocities as low as 500 fps.