Richard, Yes 2 3/4" shells function just fine in a 3" chambered shotgun.

Yes you can, either one is fine in a 3" chamber.

100 percent! It was my pleasure to assist you.

Richard, yes Sir. Any length Shotgun Chamber can shoot that length or shorter Shells no issue. Cheers and stay safe!

Yes! A 3" chamber will shoot 3" and 2 3/4 just fine, and no it won't cycle one better than the other unless you have a gun with an older gas system, then it may not cycle light target loads well. I hope this helps

2 3/4 or 3 are both fine and safe.