9mm Action Express?

9mm AE is the .41 AE necked down.
Ammo, brass, and load data are scarce.

How could it be that much different from the 9x25mm - 9mm Dillon?

It shoots the same diameter bullet. Every other dimension is different.

It would be closer to 357 SIG. In my quest to determine loads for what I call 357 SIG Long (357 SIG loaded to 10mm OAL), I came across some load data for 9mm AE. I was specifically interested in AA No. 9 powder.

I found this

https://books.google.com/books?id=3...ge&q=9mm Action express Accurate No 9&f=false

It shoots the same diameter bullet. Every other dimension is different.

Click to expand...

I mean as far as ballistics I think the 9mm AE is going to be very similar to 9mm Dillon - probably pushing a 115gr bullet between 1800 and 1900 fps and a 147gr bullet between 1450 and 1550 fps.

Without looking it up for you, I would agree with atblis, the AE closer to the SIG than the 9x10.

9mm action express is a new one to me. I do load .41 A/E. Really hard hitting cartridge.

I've heard it referred to as a wildcat. Googling doesn't turn up any commercial ammo. I can find Uzi brand 41 AE, but not 9mm AE.

The 9mm AE was actually an experimental pistol round being developed by Evan Whildin, the co-inventor and developer of both the .41 and .50 AE rounds. He was working at Action Arms in Philly when I met him and he showed me the different rounds and loads he was working on. No 9mm AE ammo was ever commercially produced.