WOW very interesting comment and sound very familiar to the new Browning A5 Hunter I bought in late 2016.
Long story short the gun had cycling issues with both hi & low brass I called Browning and was told to send the gun back to have their gunsmiths look at it after doing that twice Browning decided they would just send me a completely new gun this time with specific oiling instructions the Browning rep even went as far to tell me over the phone only a drop or two of oil was needed on the slide rails that the bolt ride on. My response was I grew up in a shotgun only state I’ve had shotguns my entire life I know how to clean them & I know for a fact I didn’t have “too much oil” on the gun. Well guess what, the second gun had the same cycling issues as the first not as bad but I didn’t pay $1600.00 for a gun that works sometimes so I called Browning again a now Browning tells me I need to shoot shells that are rated at a minimum of 1,250 feet per second I did all I could not to laugh in the guys ear while telling him Winchester SuperX 3.5” 00 buck is rated at 1,200 FPS….what a joke!!! Anyway I could go on forever just wanted you to know you not alone & the issue seems like it’s not only Barretta specific just another gun that is marketed as a multi-purpose shotgun to does not perform as marketed & sold.

The A400 Shotguns are pretty ammo sensitive so you need to break it in with high brass rounds and I’d generally avoid low brass with the A400s.