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Forum: 300 Whisper Ammo and Reloading 11-10-2008, 11:02 AM
Replies: 21
Views: 3,537
Posted By Flewis
Are you sure you aren't hearing the report of the...

Are you sure you aren't hearing the report of the rifle bouncing back to you from a hillside or berm and mistaking that for super-sonic crack? With 11 grains of 1680 I'd be really surprised if you...
Forum: 300 Whisper Ammo and Reloading 11-09-2008, 08:50 PM
Replies: 21
Views: 3,537
Posted By Flewis
For what its worth, I'm using 11.6 grains of...

For what its worth, I'm using 11.6 grains of AA-1680 behind a 220 SMK and am getting 1080 fps. Cycles the bolt every time and locks back on an empty mag. I have a 16" barrel with the gas port at the...
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