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My question now is what the heck is up with shell size differences? Isn't 2 3/4 supposed 2 3/4 standard?
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2.75" S&B 00B only fits 7 in a 590.
Get a ruler and check. When I did, I saw that the shells are less than 2.75" unfired, and closer to 2.75" when fired. The type of crimp determines the final length.