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According to Nosler the Partition only expands reliably down to 2000fps. Since the smallest .308" partition is 150gr I would think that would preclude it from use in the 300 Whisper as an effective deer round. Admittedly I have no personal experience with it though. What velocities are you Partition users getting from the Whisper?
The Nosler BT expands down to 1800 and you can get it in 125gr so you can push it faster as well. This would seem like a better fit to me.
If you want something that will hold together look at the new Barnes TSX SBR 110gr bullet. It is designed to expand in the velocity range of the Whisper. According to Barnes it is good from 1500fps to 2300fps. I bought a few hundred but haven't shot anything but paper with them yet (just working up loads).
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