I wouldn't trust the 127 LRX at 1600fps. I've had impacts on deer at 1900 and had adequate, but no more than adequate expansion. I consider 1900fps as the minimum desirable impact velocity for it. FWIW, the 127 LRX is my favorite big game bullet (followed by the .30/168 TTSX) and have had excellent results with it on deer and coyote. Will probably shoot a cow elk or two with them this year.
