little-d, I use that bullet and sabot with 150 APP it show an average of 2230 fps. Iwould like to know what 150 of 777 does. I also am using a z5 at this time the two bucks I shot with that same load this year: the first was about 70 yard and hit forward of the heart moving he went about 30 yds and the blood trail was like 5 feet wide ,the second humped his back for a split second then dropped like a wet rag. Please let us know how yours reacted and if you know the vol. what it is. Lee