No first hand knowledge on this. BUT, I have now read several postings etc. on other sites that it does work quite well. One of the original main criteria for the 300 whisper was that COL would still let it be used in the AR platform, had to be ultra short with the longer projectile. But in a bolt gun that wouldn't matter a bit. Haven't seen any load data yet, but intend to build one in the near future. Too busy just now with a 12.7X48 AKA 510 whisper, and a 500S&W hybrid subsonic guns.
If you do go forward with one, please post anything you learn further about actually doing it!!!
Thank You,
Emory Jones
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