I have probably killed 40+ in my life time & your 7X57 will do just fine. My experiences with the Nosler BT's are not good (.243 to .300 mag). They give too violent expansion. So if you value the meat my advice would be to not use them.

There comes a time when one must take a position that is neither safe, nor polite, nor popular -- but one must ask, "Is it right?"

Martin Luther King, Jr.