TC,

The tumbling issue is going to surely be bullet specific, I am sure. Many folks do not realize that the 556 for the military was designed for the bullet to tumble and break apart. But for hunting in this day and age, there are more bullet choices that are not designed to do so. I suspect the Barnes bullet for the 30 AAC is also not designed to tumble, but I could be wrong. I guess that comes down to sub v. super sonic.

And I almost posted that one reason to stay with the Whisper over the 300 is out of loyalty or satisfaction with SSK. Looks like you are already there ;^) That is one of the other reasons I did not do the 300. I have had a few SSK JDJ's, and I am a bit like a dog in the loyalty department sometimes ;^)

Craig