How many dogs have you killed with the HMR? I was not impressed with the performance at all.
Haven't had it too long and haven't tried any real long shots. Several in the 100-150 yd range with few problems. Stay away from the front sholder blade (small bullets lose against thick bones). I simply hunt them to protect our cattle herd so as much as it might bother others I really don't care if it runs off and I can't find it. I would stick to the larger calibers if a guaranteed kill is desired, but keep in mind that they do more damage to the pelt.