I think you are somewhat behind the curve.
There has been small primer .45 auto for some time now.
Started out as lead-free ammunition because of the characteristics of the Dinol priming compound, but it looks like some companies are just using small primers to maybe save a few cents a case.
Ask around, there are a lot of people complaining about the small primer cases contaminating their supply of large primer .45 ACP. You can probably get a good deal on what they are discarding anyhow.