300 Whisper vs 300 AAC Blackout chambers, reamers

Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge.

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rancilio
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Posts: 11
Joined: Wed Mar 31, 2010 12:51 pm

300 Whisper vs 300 AAC Blackout chambers, reamers

Post by rancilio »

I intend to build a silent bolt pistol with a Shilen 16in SS barrel
based on on an XP-100 action. I already have a break-barrel single-shot TC
Encore 16in MGM barrel in 300 Whisper and an M&P 300 Whisper/300 AAC
Blackout with a JP silent buffer and JP adjustable gas block, and a couple other
XPs in .223.

So my questions are, do I chamber the XP in 300 whisper or 300 Blackout?
Will I compromise accuracy yet gain flexibility with a Blackout chamber when
shooting Whisper spec'd brass or ammo? I know that my Encore Whisper
is MOA, or as close as I can tell out to 150y.

"They" say whisper can be shot in blackout but blackout should not be shot
in a whisper. I see some slight variations to chamber dimensions all labeled
300 Whisper or 300/221 or .30/221 or 30-221. An old spec I saw did not
even get to the thousandths place which would make the the whisper and
blackout the same.

I intend to reload, but just have not gotten there while still active duty
and moving around. I have the chamber specs and have read everything that I
can find but cannot decide.

Shilen has both reamers by the way, or at least a .30/221 and the Blackout.
Should I try to get MGM to chamber the XP Shilen barrel so that my Encore
and XP identical chambers? That seems to make sense to me. I asked MGM
if they work on other-than-Encore (or Contender) barrels and they said no...

Please let me on to your wisdom. Thanks.
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300Blk
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Joined: Mon Apr 25, 2005 9:31 am
Location: USA

Re: 300 Whisper vs 300 AAC Blackout chambers, reamers

Post by 300Blk »

Now that the standard is out I can't see any reason to go with a pre standard. It is like wondering if you should go with 802.11n or 802.11 pre-n.

If you are asking if 300 BLK is less accurate - no, there is no evidence it is less accurate.
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