http://www.ar15.com/forums/topic.htm...f=121&t=516732
Quote:
You can't just ream out an existing chamber. Doing so would alter the headspace which is something you can't fix as that would cause problems with the gas tube length.
All of which is moot cause the 300 Blk is the same thing as a 300 Whisper. The Blk is just a saami standardized 300 whisper
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You can ream out an existing chamber. You can do it with a normal reamer being careful to not increase headspace, or you can do it with a special reamer as discussed in this thread. Further, 300 AAC BLACKOUT is not the same as CIP 300 Whisper(TM).
There is more freebore in 300 AAC BLACKOUT, which means if you load ammo to max pressure for each, you will get more velocity from 300 AAC BLACKOUT. It also means if you load ammo to be max pressure in 300 AAC BLACKOUT, and then shoot that ammo in 300 Whisper, you will likely have additional pressure.