I recall JD telling me he also has a .338 Whisper #2, which is based off the .221 FB case. He did say it is a specialized chambering? I was going to order it in a contender carbine, but it would be strictly a subsonic round. He said the 300 Whisper is the best all around Whisper cartridge, so that is what I got, although the one .338 Whisper(#1 off the BR case) was a fun barrel. But just chronoed my 10" this past week, and I'm happy with the 125 BT @ 2184 fps, and the 150 BT @ 2020 fps. I know I can get slightly more with the 125 BT load, but they all shot 1MOA or less, and hesitant with messing up a good thing.
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