It is not a coincidence that every single shotgun designed and marketed as a target gun has a 2.75" chamber.
Well, many Browning Citori's are made, and were made and marketed with 3 inch chambers so that owners could hunt with them also with 3 inch shells, if they didn't only want to shoot targets. The Browning Silver series are 3 or 3.5 inch.
The Beretta 391 is only available currently with a 3 inch chamber, and used by many world class NSSA shooters to shoot the 12 ga events, and wow, marketed as a target gun!
Here's Beretta's own site as a reference
http://www.berettausa.com/product/product_competition_guns_main.htm
So, take advice from someone who doesn't know what they are talking about, stating that "every single shotgun designed and marketed as a target gun has a 2.75" chamber"
Or, research for yourself and listen to people who actually know what they are talking about, shoot the products you're interested in, and who live in your own area in the country who you could call on to validate recommendations, and can verify what they are talking about by a simple phone call or drive to their club, or believe someone who just posts alot.
And if you choose the latter, I know this guy with money in Zimbabwe who has a few million he'd like to deposit in your bank account, and you can keep the interest if you give him your account number, and then when you're done, this AOL guy wants to test his email system, and if you forward this, he'll give you $2,500