Quote:
Originally Posted by ohnomrbillk
Since the Whisper was never a SAAMI spec cartridge, I fail to see how one can apply the 556 vs 223 argument. The whisper was whatever the end user made it. The difference between my chamber and a blackout chamber is less than what difference you will find in individual gunsmith's preferences in verification of head space.
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Headspace is allowed about a 0.006 range, while the throat in 300 AAC BLACKOUT is about 0.050 longer than in 300 Whisper(R) (about the same difference in the 6.8 SPC-II vs the 6.8 SPC throat).
300 Whisper(R) is proprietary but JDJ still has a fixed set of drawings for it. The 300 AAC BLACKOUT has a longer throat than 300 Whisper, just as 5.56mm does compared to 223.
Quote:
Originally Posted by ohnomrbillk
I own a S&W revolver in 45 Colt, a Ruger single action in 45 Colt, and a Marlin lever action in the "same" chambering. Throat sizes are different, and if one wants accuracy out of each with cast bullets, you size to a different diameter. The Smith and Marlin have loose enough chambers that I keep the brass separate. Should I start calling them 451 Ruger. 452 Marlin, and 453 S&W?
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All of the chambers you just mentioned meet 45 Colt SAAMI specs as an allowable variation. The 300 Whisper(R) does not meet SAAMI specs for the 300 AAC BLACKOUT because the chamber is outside of the range allowed by the SAAMI drawing. Likewise, 223 does not meet the dimensional specs for 5.56mm.
Quote:
Originally Posted by ohnomrbillk
My Ruger MkII won't feed CCI subsonic to save its life. My BRNO Mod 4 eats them great. I guess one isn't a 22 LR?
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That would depend on if they are within the specs for 22lr.