I have shot a few animals with 125 gr nosler ballistic tip out of my 300 whisper. They penetrate very well and do enough damage to kill a deer cleanly, but they don't have the grunt of a 308 or 270. So beware if you are going to try neck shot, YOUR bullet will need to touch the vitals!
As for subsonics (220 gr/240 gr smk and 208amax), despite all the internet rag about them,( as said above )they do not clean animal well. They fly through with out stoping, inflicting wounds sometime not wider than the bullet diameter, living the animal in pain till you finish it properly .
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