I already called and spoke with SSK. This is where part of my confusion is. They told me on the phone that they only chamber the 338 whisper in the AR10 (308) platform and it is based of the 7br case. They don't make a .338 whisper for the AR15 based off the .221 case. I asume that this has been dropped and the website is incorrect or out of date.
I called on the spectre cartridge as well and there 338 also is built from the 10mm case. THey won't build it from the .221 case either because of the lack of shoulder.
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