I agree with Chad that it is a bit high for that condition, but have to disagree with him that it is unsafe to shoot 2 3/4" shells out of a 2 9/16" chambered gun. Generally, the only issues you will have in doing this are failures to eject as the longer, fired shell will hang up on the ejection port. I have a 1916 production 16 ga. M12 that has not had the ejection port opened up, but it runs Remington 16 ga. almost 100%; 2 9/16" shells are also available and not terribly difficult to find, although your local Wal-Mart won't have them.