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I have a couple of 300/221 barrels laying around the shop with the gas system in the carbine position that people have given me. They simply don't work reliably for what the 300 Whisper was designed for. When I was designing our 338 THUMPER I didn't care about supersonic, my main concern was could I get the 300 grain bullets going 1050 FPS quietly. Once that was accomplished we figured lets see how fast we can get the 160 grain bullets going which is 2100 FPS, but it is what it is and I wouldn't change the design to get more speed because that is not the point of either one of these cartridges.
To cycle subs reliably and as quiet as possible and use the full range of powders the gas system has to be in the pistol position You must then use a three position or an adjustable gas block to choke it down to cycle supersonic loads.
There are better supersonic cartridges out there if you want mostly supersonic. Its just an added bonus of the Thumper and the Whisper.
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