I sent an email to Barnes asking what some of their bullets minimum impact velocities were on some of the bullets I use and this is the information I got back. Figured I'd share if others were curious like myself.

.277 129 gr. LRX- 1400 fps

.284 120 gr TTSX- 1700 fps
.284 139 gr. LRX- 1400 fps
.284 145 gr. LRX- 1500 fps

.308 150 gr. TTSX- 2000 fps
.308 168 gr. TTSX- 1500 fps
.308 175 gr. LRX- 1500 fps
.308 180 gr TTSX- 1500 fps

You ain't about that life.