When my 930 SPX was new, it did exactly the same thing with Federal buckshot. With just a little prodding, Mossberg CS sent me a return label. It appears they honed the chamber. All I know is it now runs those same Federal loads, and everything else I've tried, Like a top.
Note: When I sent the shotgun back, I included several of the offending fired hulls and a note telling them that they had been fired in this shotgun. I don't know if it made any difference, but at least they would be able to see the problem.
Note: When I sent the shotgun back, I included several of the offending fired hulls and a note telling them that they had been fired in this shotgun. I don't know if it made any difference, but at least they would be able to see the problem.
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