I have four reloads on the case of hulls I bought last year from wallyworld. It looks like the crimps might crack off before the steel bases fail, so I might start roll crimping them with pumpkin slugs.
They're very mild steel bases, and quite soft and pliable. I do have to size them every time, unlike my brass based hulls, where I don't bother.
I've heard alot of moaning about different hulls, but I'm not seeing alot of difference myself, when patterning. What I'm seeing on the paper (free at my club, thank god), is that wad selection, and a good consistent crimp seems to be the two keys to getting good patterns*.
*except for my buckshot loads, where using ground plastic buffer made all the difference in the world; even as close as 20 yards which was a surprise. I have also found that using the buffer has reduced leading that I get when using the softer alloys that I'm getting now from the cable sheathing and roofing flashing. That's a very good thing for me as I cast my own buckshot and buying hardening alloys from rotometals adds up pretty quickly on a students budget.