If your 12 gauge only takes 2 3/4” shells, and there is no way you can swing a new shotgun before this fall, you may feel that long range turkey hunting is not an option. That is not the case anymore. You can still extend your range past 40 yards thanks to the advancements of HTL shot. Standard turkey loads don’t offer any good options in that shell size. Look at Hevi-Shot Duck loads instead. Don’t let the word “duck” bother you. They will put down a turkey just like a turkey load. You are going to have to use #7.5’s to have a decent chance. Try the same choke diameters that you would use for standard turkey loads. I would only recommend this for 2 ¾” shells as there are better options in 3” and 3.5” shells. You can realistically expect to reach 45 to 50 yards with the right choke. At 1300 fps, you will have more than enough penetration for turkey. Give it a try.