I have a Truglo TG170X that I used in my 3" 870 Express. I used primarily the black Wincester #4's in that gun & missed only 1 bird. I just got a 3 1/2 870 Sps-T & I want to go w/ Hevi-shot Magnum Blend. Truglo's website says the 170X is compatible w/ "Hevi-shot". But it also says "no steel shot" used with the choke. My question is, because I'm not 100% sure...is the Magnum Blend steel shot? Any help would be greatly appreciated.