Would be interested in seeing what the FTX would do around 1600-1700fps vs the 2100fps in your tests. For light-skinned game, I would bet it would fare a little better if it was slowed down a little. I realize it's only a deer bullet, I wouldn't recommend it for anything larger, certainly not for anything that may bite back!
If you want penetration, a hard cast FN or a Punch bullet would be my choice.
