I just got my SBE out of the box and ran a variety of loads through it. I started with 3-1/4 dram 1-1/8 oz of shot and it worked fine. I backed it down to 3 drams & then to 2-3/4 drams each with 1 oz of shot and it cycled everything. On the final shot with the 2-3/4 dram loads the bolt did not lock in the fully rearward position (though the action was partially open) however the first round cycled sufficiently to eject and then chamber the second. All of this with no break in period. I fired approximately 50 rounds through it.
Have you contacted Benelli yet? If so what have they said?
Take care