You can use those barrel on a 2 3/4" receiver but the fired hulls will not eject. The 3" shells will feed from the mag tube without any issues at all but the empty hull that is stuck in the ejection port still renders the gun a single shot. The 3.5" fired hulls will require that you remove the barrel to get the hull out as well. Now, depending on when your gun was built, there is a possibility it will cycle the 3" shells without a problem as Remington had 3" ejectors and ejector springs in receivers that where not stamped with the typical "Magnum" receiver markings. If you do indeed have a 2 3/4" receiver it typically costs between $40 and $60 to have a gunsmith change out the 2 3/4" ejector spring, use a dremel to modify the ejector and re-install a 3" ejector spring. You can also get you existing barrel chamber lengthened to 3" for a whole lot less than the cost of a new barrel. Best option is to leave it as is and use 1 1/2oz magnum loads of 5 shot...if you can't kill a turkey with those, I'm afraid the longer rounds aren't gonna help much! 100 years ago the turkeys died with 1 1/8oz "heavy loads" just as dead as they do today with 2oz and 2 1/4" "Turkey" loads!