Quote Originally Posted by mikeh1911 View Post
From what I understand and please correct me if I'm wrong, the Whisper can work in a 300 but be careful about shooting a 300 Blackout in the Whisper chamber. Like shooting 556 in a 223 chambered gun.
Exactly.

However,,, there is no standard version of the 300 Whisper. There is about a million different flavors.