John, this has a 3 inch chamber so 2.5 and 3 inch shells will fit and function just fine. This does not use a choke system. If the owners manual says not to use buckshot and slugs I probably wouldn't recommend doing so but you can always contact the manufacturer at 1-800-948-8029 Monday - Friday
8:00 am - 6:00 pm for a definite answer. Hope this helps.

Hi John and welcome. It has a 3 inch Chamber and will fire 3 inch and shorter shells no issue. Factory Slugs and buckshot are not an issue being fired. Cheers and stay safe!

John, yes sir, the Brawler has a 3" camber. It has a 9-inch alloy steel barrel with a 1:24 RH twist. From the owner's manual - "Do not use slug ammunition. Slugs are unsafe in these guns."
Stay safe & have a great day!

Yes, you can shoot 2 3/4" up to 3" .410 magnums from the Brawler, no it does not have chokes. Here are the Specs:
Firearm Specifications
Manufacturer: Rossi
Model: Brawler Single-Shot
Caliber: 45 Colt / 410 Bore
Barrel Length: 9"
Overall Length: 14.3"
Height: 6.3"
Width: 1.38"
Weight (empty cylinder): 36 oz.
Receiver: Steel with Polymer Over Mold for All-Weather
Grip: Rubber
Barrel Material: Carbon Steel
Sights: Iron Sights with Picatinny Rail
Safety: Transfer Bar / Cross Bolt