Howdy
I bought the Marlin .357Mag/38Sp Model 1894CS at the bottom of this photo used close to 20 years ago. I bought it for Mrs Johnson to use in CAS when she found my 24" barreled Winchesters too heavy.
A friend slicked it up and it is a real smooth shooter. The barrel is 18 1/2" long.
We have a thing in CAS where we need to be able to fit ten rounds in the magazine, because that is how many rounds we usually shoot out of the rifle during a stage. It's better if we don't have to reload. As I recall, when I bought it ten 38 Specials fit into the magazine, but only nine 357s. It did not really matter because Mrs Johnson was only shooting 38 Specials out of it anyway. I think the friend who slicked it up shortened the follower so it will fit ten 357 Mags, but I don't really remember.
By the way, the 44-40 Model 1894 at the top of the photo was made in 1895. I don't really know how old the little Marlin is, I just have a pretty good idea of when I bought it.
Here is another shot of the little 1894CS with a Model 39A.
As I recall, the front sight came with a hood over it. Those are illegal in CAS so I slid it off.
The rear sight is a nice semi-buckhorn that folds down in case one wants to mount a scope on it. The receiver is drilled and tapped to mount a scope.
Here is the marking on the barrel.
Anyway, the Mrs does not shoot Cowboy anymore, but I held onto the rifle. It's a real sweet shooter with 38s, and a little powerhouse with 357s.
Regarding the length of 38s to feed through one of these, I will have to look that up. There is well established over all length for 38s to feed in these babies, I just don't remember what it is.