What is the other metal?
Blazer produces some Aluminum cases and I have seen a lot of steel cases from Eastern Europe.
I have seen several posts where some individuals have reloaded both of these cases.
Personally I would not reload them at all. Aluminum although hardened will work harden to the point it will become brittle and crack.
As for the steel, I would not use even the original loads in any of my guns. The cases are harder and I don't want them in any of the chambers on my guns.
Stick to brass, you can buy once fired genuine brass pretty reasonably. Why would you want to use a material that was used to cheapen the cost of the original load. None of these aluminum or steel were ever designed for re-loading. Brass was chosen over 100 years ago because it provided lots of benefits and virtually no negatives. No one has yet come up with a better material. it has the right elasticity, strength and ease of forming and re-sizing.
I saw 9mm once fired brass for $6/100 at a gun show yesterday, 38 spl was $9/100. ,most of the other calibers were in the same price range.
Use brass and have peace of mind.