CCI "Blazer" (centerfire pistol) ammo is aluminum cased, and Berdan primed, deliberately made to be non-reloadable.
CCI also makes "Blazer Brass", ammo, which is regular, reloadable brass cases, and is more expensive than the aluminum Blazer ammo.
Back in the dark ages of the early 70s, as a beginning reloader, I got a bunch of greenish looking GI .45acp "brass". Not knowing any better, and never having heard of steel cases, I did reload them. Once. The primer pockets were not quite big enough, but this teenage reloader managed to smash CCI primers into them. They did fire, but I had about ruined my sizer die, and I wasn't going to try them again.
They were FA 43 headstamped, if I remember right.
Don't reload steel cases. Even if it works, its bad for regular dies, and usually not good for your guns, unless like Soviet designs, made for steel from the "ground up".
It may seem like a good idea, but it usually turns out to be false economy.
In my opinion, running steel through a valuable and historic gun like an M1 Garand is not only risking damage, its disrespectful.