DIY heat treating

[USGI]

I just checked the few steel 45 cases I have and compared them with '06 - almost exactly the same like DaveHH mentioned. Several of the head stamps are "TW 5" for Twin City 1955, if I'm reading those correctly. Only have (2) left of the "EC 43" - one has a large font and the other is small. I thought once about reloading them just to see if that would work, but never got around to trying it - I probably wouldn't have been the first! - Bob