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10" barrel was shown in your data, but the 2013 Annual shows 4" tube. Hmmm, I'll bet you are right. I'll bet they had a misprint of some sort.
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Funny that...On-line doesn't show barrel length. But that particular data hasn't changed in a few years for 357.
Your 2013 annual shows 4"
2011 annual shows 10"
2009 annual also shows 10"
I see your confusion. Had I seen 4" I would assume a +/- 100 fps. range acceptable and 250-300 fps deviation suspect too. Even with the component changes.