Mas is correct of course.
1100 is a fine gun!
Mas also brings to light something "we" have harped about a lot.
Guns are designed to run on certain ammo. At the time the guns were designed, they did not have 'reduced recoil' or loadings such as 7/8 oz loads or even 1oz loads.
Gun is not going to run with something it was not designed to run on. 1100s, Winchester 1400s, Beretta 303s...Does not matter if clay games, hunting, or Promo Ammo for training class, or reduced loads for a training class.
One HAS to use what the gun is designed to run. Check to make SURE ammo runs in gun, and Pattern YOUR gun for patterns and slug groups in order to have an effective tool - the shotgun.
It does not matter what the fellow down the street says, a box of ammo says, or what everyone is using. Just a starting point, Now TEST for YOUrself to know.
Now Trainers like Mas Ayoob, Awerbuck and others, see a LOT more guns, and LOT more Ammo than most folks, so Listen to them for suggestions.
Just like clay shooters can share what they see running the circuit. Some clay shooters shoot 20K + rounds a year themselves, not to mention what they see fellow shooters shoot.
Mas, Awerbuck and others - shoot and see a lot more than most folks do for serious shotgun use.
As Awerbuck says " Gonna be your gunfight, I am not going to be there".
One more thing. Gas Guns as part of the design includes Dwell Time. Short laymans version is - DO NOT shorten barrel on a gas gun just to be cool!
DO NOT mess with ports for any reason, recoil, to shoot a certain loading.
Only a Qualified GunSmith should mess with this.
You mess with barrel, ports to shoot a "reduced recoil" and that same gun MIGHT glitch with Full Power Loads.
Messing with something will get you dead. Bad enough a gas gun won't shoot hunting loads, or clay loads or ...
Mess with a Serious Use firearm and not know what you are doing and Dead is Dead.
Just had to toss this out for readers thinking about messing and tweaking. Don't.