Musta been a 6mm of some sort, only vmax in 25 cal is the 75g. Only 87g vmax I know of is 6mm anyways...
But yes, the 75g vmaxs are hel on coyotes, and your barrel and throat as well. There ok out to about 500 yards, but after that, there BC gets to them, they start to drop and drift like a rock...I've shot a few hundred of them out of my 25-06's over the years, but I never stick with them. There great for calling/truck rifle, but any type of longer range you need the heavier bullet.
The 85g NBT is an awesome yote bullet, and flys pretty good out to 600 yards. The 100g NBT is also a great yote bullet if your looking to still have flat trajectory, they shoot pretty good out to 800 yards for me. If you want 1 bullet to do all, shoot the 115g NBT and you'll kill deer at 600 fairly easy, and coyotes to as far as you can hit them.