Use plastic empties cut down to 2 1/2", deprime with a spike, reprime on hard flat surface with dowel and hammer. Use 80 grains of ffg (3 dram),this next step takes a bit of trial and error, use a wad column of card wad and then felt on top of that and then either 1 oz. or 1 1/8 oz. of shot. There must be a 1/4" of case mouth left over for you to roll crimp with a roll crimper that attaches to your drill or better still, drill press. This crimper is avail. from Wil Bilozar in Alta. as well as many us retailers such as Precision reloading, etc. There you are, reloading for 12 ga. 2 1/2" with equipment investment of about $15..........don't hesitate to post if you have questions or problems...Ben