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Using a 120 gr I'd opt for the faster bullet. 200 fps will not make ANY difference to the Barnes X. I've pushed them that hard in a 280 and 100's in a 25/06. They don't blow up or "pencil out." They do open up and keep penetrating, creating a uniform wound channel, usually exiting the other side, and causing major systemic disruption in the process.
The lighter bullet pushed faster will give you greater kenetic energy since velocity is a bigger factor that weight. And you'll get flatter trajectory in the process.
I've got 18 one shot kills in a row going with Barnes in a variety of medium calibers, including a 260 cal XP handgun.
Only one with TSX (a 140 gr doing 2900 out of a 7/08) but judging from the results it's more of a very good thing; with even better accuracy and less fouling.
I've also taken several neck shots but find that hitting them in the lungs (where there is more water to open them, they work best with hydrostatic pressure) just under the spine, produces the most spectacular instant kills.
PS. I can't comment on the graph but using a 130 X out of a 7/08 I once shot the LENGTH of a big MN buck. The bullet hit at the neck/body junction and transversed the entire body (he was looking head-on) and lodged under the hide of the right ham.
He didn't move a step. Another buck at a measured 265 yards..complete penetration....dead deer. An elk at 260+ with a 7mm Saum and 150's. And several deer up close and personal. Nothing, not one, went even 50 yards.
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