I prefer to keep them at 2000+ even though I've had stellar performance down around 1950. The last 11 deer I've shot have been with TTSX (10) or e-Tips (1). I've only been blue to catch one of them (I tried to catch that one) and all critters have died within 10yards except one little small doe than made it almost 100. Then again, 60 yards of that 100 was skidding face first down the side of a ravine.
I'm a huge fan of Barnes bullets, but I think 1600 on an LRX is BS after seeing them expand at 1950. That's my cutoff.
