I shoot the Federal #9 TSS loads through a Carlson Extra Full flush choke. I think it is a .580. It shoots very well. I have had issues cycling the Federal TSS rounds due to the shell is slightly longer than standard 3" shells due to the roll crimp. It will cycle 3" shells that are not roll crimped with out any issues every time. The shell will cycle up to the point it is supposed to go into the chamber then it just sits there. I only have to lightly touch the bolt handle and it will slam home. I can put the Federal 3rd degree 3" shells or Long Beards they will cycle with out issues. It's only the roll crimped 3" shells I have issues with.
Regardless I love the gun. just started hunting with it last year, killed two birds and a coyote with it. Very light and shoots great.