I have the Magbolt, and I shoot 295 powerbelts, with 80 grains of Triple 7, in FFFg form. I've been shooting that load for several years now, and have killed every deer with one shot. The bullet goes through the shoulder, and usually lodges just under the skin on the other side. Not one deer has gone more than 30 yards!! Try it out, it may work for you!!

PS: The Triple 7 is in loose form, not pellet
The powerbelt can be either aero or hollow pt./copper coated.