Seems people like this caliber. What's so exciting about it? I see a short shell offering a low velocity, and with precious little shoulder upon which to headspace. Has anybody ever done a .277 Blackout? A .264 Blackout? A .257 Blackout? You'd get more velocity and get some shoulder area upon which the case can perch in the chamber. And why the name Blackout? Is there any special meaning regarding the name?