cayugad
Right now I am shooting the .430 300 grain XTP Hornady HP with 120 grains of Graf's & Sons 2f black powder out of my GMB Renegade. I figure it will hit hard, expand, and even if it does not pass through should release enough energy inside the body cavity to do what it needs to do.
I think you will like the 44/300 XTP - while it is a regular XTP itis built to function across a wider range of velocities...+ of couse it has a higher BC. I would almost bet you anything that you will get your pass throughs at any resonable range, but with good expansion. The only thing I worry about is stripping the lead from the copper on thicker skinned animals or an angle shot through heavy bone mass. The only thing that hold the lead in the copper is the ring so if you get expansion beyond that point you stand a CHANCE of stripping the lead out. Another reason (in my little mind) that I have a switch to Bonded Gold Dots...
Just for the record - I am a total pass through person - I kinda demand the pass through with massive hyrostatic shock interanally - hence my over zealot (sp?) thought that I need to shoot Noslers....(never have gotten into barnes all copper bullets although they do the same thing). Hopefully I will be able to show you what I am talking about this season before it is over... I am trying to carry a camera with me all the time instead of leaving it in the truck and picking it up after the thought.