When using cast bullets for whitetail deer I would like to try some that will expand. Previously, I used WFNGC with good results but would like to experiment with softer expanding cast in 44mag and 45 colt. I believe I need a gas check and a bullet hardness in the 16 to 1 range. [94% lead and 6% tin] The fps range will be 1000 fps-1300 fps. Is this the right way to approach getting proper expansion? [I am talking about not hitting major bones] Can you tell me any of the pros and cons?