Calib: My son did pretty well on the few coyotes he shot with the 58 grain V-max out of his Ackley but he never put one on the shoulder. Judging from the terminal performance on jacks (total devastation on the lines of a .20 cal 32 gr V-max), I think it may be a little too fragile. They may splash on those quartering-on shoulder shots. Ballistic Tips are a little tougher than the V-max so I imagine they might make it through a coyote in a 70 grainer. The construction of the 55 grain BT would probably be closer to the 65 gr V-max. It's a pretty fine line we walk trying to keep the bullet inside a coyote without splashing. We'll see. Field testing is the fun part! gun)