I haven't tried it in a ML rifle, simply because I worked with it so much in an assortment of cartridge guns. Speer makes shot capsules to load your own for 38 and 44 caliber handguns. CCI provides factory loads for 22s. At one time TC made barrels and offered loads and components for their Contender in 357 and 44. The barrels even had special "chokes" to help open the plasitc shot capsules, and the shot loads were pretty substantial.
I messed with all of them, plus ginned up a few of my own for other handgun calibers, as well as trying some of the 357 caliber shot cartridges in 35 Remington, 358 Winchester and 35 Whelen rifles.
Performance across the board was so erratic that I couldn't depend on the loads at any range at all, as in chasing small games or wing shooting. I did use a bunch of the 357 Speer loads in handguns over the years in serious snake country. They worked fine at those ranges, but frankly so would a big stick.
It would be a fun project to try doing it in a ML rifle while protecting the rifling, but I wouldn't get my hopes up. If I had saved all the money I spent on components messing around, I'm sure I could have bought several smoothbores and still had change for loads.