Lifetime Supporting Member
Feedback Score: 1 reviews
Join Date: Jul 2007
Location: Austin,Texas, by God!!
Liked 4120 Times on 2105 Posts
Likes Given: 523
The Whisper is based on the .221 Fireball brass, necked up to .30 cal. The BLK is based on the .223, cut down and necked. The BLK has a much thicker neck. The chamber is made to allow for the thicker neck. You will get more neck expansion upon firing with the Whisper and possibly more gas blow by. This will affect performance to some degree. No you will not get "identical" performance with the two, but pretty close
In life, strive to take the high road....It offers a better field of fire.
"Robo is right" Fuzzball