I've played with a .300 Whisper with a J. D. Jones upper on a Colt lower. SSK puts an adjustable gas valve for suppresssed and full powdered loads.
I've found it aggravating, trying to load right below the SOS. It seems if you're running it that close, just a bit of variation blows your sub sonic cover.
I guess one has to leave enough margin so that doesn't happen.
I'll bet that .375 Whisper is a hoot to shoot...
I've talked to J. D. on the phone, although some years ago, found him helpful and pleasant. He's getting pretty long in the tooth, must be in his mid 80's or better. Not sure how active he still is in the business. He's done some really interesting things in his career.
DF
