Grafs & Ballistic products carry the magtech brass. I think the spec. said 2.4" for the 2 1/2 28 ga. Guess I will try some of those and see how they work. I have some Goex fff that I have had for a long time and this will be a good time to use some of it. I have some 24 ga over shot cards but not the over powder cards. Will they work or do you need the overpowder cards as well. Have 28 ga but as you indicate may be too small. Dwight