Onslaught,
The roll-crimp is, as others have said, the culprit. But, with that roll crimp, you get 3 extra pellets.
CMOS,
Not in my shotgun. The S&B shells produce a pattern that is slightly larger, on average, but it still stays nicely inside a B27 at 10 yards.
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Smith & Wesson is dead to me.
If you want a Smith & Wesson, buy USED!
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