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LOL!!! My titles are kind of an inside joke with some of my friends. A true 300 Whisper has a longer throat than the Blackout. The 300 fireball / 300-221 and all the other names you can think of have a shorter throat. It may not be the case with early Whisper. It is my understanding that the very early ones had a tighter neck area and required the use of 221 cases. I have no Idea about the throat on those chambers. I had zero pressure issues with the Blackout in my Whisper. I do have a selectable gas block. The actual load was less than my standard load with 125s. I believe it was 18.5ish grains of h110. (Quoting from memory) The Blackout chamber is two thousandths larger in the shoulder and one thousandths larger in the neck. The unfired cases are the exact same spec as Hornady 300 Whisper brass. The big problem with firing a Blackout in a Whisper, is knowing your gas port size and your chamber. Did someone sell you a 300 fireball and call it a Whisper? I would determine your maximum OAL with the Blackout bullet in question and compare it with the factory load. I may be able to get 100 or so Accutip bullets and load them to max OAL and see the difference. I would not fire my hot Whisper loads in my Blackout. My Blackout has a larger gas port so that I can use VV N110 with subsonic ammo. If you know your gun, It’s not a big deal.
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