mnduckngoose wrote: on the the barrel is says only use 2 3/4" or 3".
DuckManClyde wrote:i just talked to the benelli tech, my forcing cone theory was right, your safe to shoot the 3.5 shells
If the barrel says 2 3/4" and 3" shells only, then I would not shoot 3.5" ammo in it.
I don't care what some guy on the phone tells me. Spoonneck may be on the right track....or something similar.
I have eight 12ga barrels with 3"-chambers. They will all
accept a 3.5" shell. The "lip" you talk about is not a lip/step, but is the forcing cone in shadow (run a 1/4" dia. wooden dowel down the chamber and you'll see)
The only gun I have that will not fully accept a 3.5" shell is a target gun with a 2 3/4" chamber. That gun will almost
take the 3.5" shell, but the shell starts getting tight (touching the forcing cone) with about 1/16" left to go before it's seated.