The trick with mastering the Shockwave and managing its recoil is learning proper shooting technique with it.
https://www.youtube.com/watch?v=VLxOmvuY3Sk
If all else fails, buy an OpSol Mini Clip Adapter and shoot those 1¾" Mini Shells made by Aguila and Federal out of it. They have similar recoil to .410, but they're much shorter so you can fit a lot more in the magazine.