I'd love to, but I refuse to pay the idiot anti-noise pollution tax.
CATI, while I'm far from the final word, I suspect you will need a custom barrel. Kimber, Cooper and some of the other semi-custom shops could easily fix you up right, but at a price.
I find the big bore whisper type rifle interesting since you get some heavy pills moving just under sonic boom levels. That would be a fun rifle to take varmint hunting at night with some exotic scope.