Yep, both that and the "Colt" offering in 36cal.
Works and works rather well.

If performance is your game though you´re better off with LEE´s so called Ruger bullet of 220grains on 456 diameter.
The Johnston&Dow is rather pointy why it first up takes the area of an original gun underneath the rammer to fit, for most makes, and it turn it limits the capactity for powder.

Mark. I´ve basically abandoned the setup of filling the cylinder up with grease and gone to using 1/8" greased wads underneath the bullet instead. In other words, that takes up space too.

https://i.postimg.cc/3rkvL54K/Colt_(1).jpg

Here the 220 at work in a 1860 Army. Yes, an original gun.