There was a 38/45 wildcat.

https://en.wikipedia.org/wiki/.38/.45_Clerke

 

There was a 38/45 wildcat.

https://en.wikipedia.org/wiki/.38/.45_Clerke

There is indeed a .38/45 wildcat. Years ago I had a gunsmith set up a 1927 Argentine to use multiple calibers by swapping slides, barrels, springs & mags. One of the calibers he threw in was a .38/45 and included the reloading dies. Forming a case is as easy as running a 45acp case through the .38/45 sizing die. I've always thought that it would approach .357 Magnum power although after some 30 years I've still not actually used it.

 

I have 400 Cor-Bon barrels in my Glock 21 and Gersan 1911 45. Fun to reload, easy to find brass and bullets (just bought 240 new Starline brass on GunBroker for $40). Started out necking down 45 ACP brass, but would split after 2-3 reloads because of the higher pressure in 400 C-B, then tried 45 ACP+P which worked fine, but the Starline stock brass is your best bet. Also tried small pistol primers, then tried small rifle (Remington) which has a little more noticeable recoil. Sierra 6th manual has load data for the cartridge, very similar, within .1-.2 grains, of 10mm with the same bullets (135, 155, 165 grain). Mostly use WSF powder, but have used AA#7 and HS-6. Die sets are easy to find, have Townsend (carbide), Hornady, RCBS, Redding, and Lee. I use a 45 ACP carbide sizer first, then the 400 C-B sizer for the neck down so no lube needed. Get a barrel for your 45 handgun and have a nice shooter!

 

38/45 Clarke I think was one and then 38 casull.
Mind you based off 357 diameter not 355/356 of 9mm.

 

I had a 40 Super, which is also a 45 case necked to 40. It was really something to shoot. It was a Glock 21, I sold all my Glocks and it went with the rest. I have thought I'd see if BarSto would make a Sig P220 barrel for me, but I haven't yet.

 

Is a 400 Corbon harder on the frame than a 45ACP? I am trying to decide what pistol to get a barrel for. A steel frame 5 inch gun or an aluminum frame compact. The full size would be the better choice but the compact would be the most fun I bet.