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If I was you, I'd stick with published loading data to start with. One of the main reasons I was shooting the boat tail bullets backwards was because I wanted to try them out on game and see if I was able to get the subsonic rounds to give me any more killing power (heavy subsonic match bullets don't expand on game).
There are several websites that I have read that talk about the teardrop shape of a bullet being most efficient at subsonic speeds. This is a loaded discussion since there are so many different factors that come into play with subsonic bullets. I think the jury is still out until someone reports on extreme range shooting results with them. I personally have no interest in shooting subsonic bullets beyond about 150 to 200 or so yards. But with the right rig, I have heard that the 300 Whisper with subsonic loads is very impressive at very long range if one has a scope that will allow for yardage adjustments and you know your exact target distances.
If I had a new AR in 300 wisper and was only going to plink with it, I would just shoot 'normal' loads through it. My interest is in single shot subsonic suppressed rifles and the feeding etc is totally different.
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