I shoot my 96/44 lever-action 44 magnum a lot but it is only at targets. I love the fact that I can shoot many different kinks of re-loads, everything from from mild to wild. The gun is light, fast and the 30 degree lever is great. ...as far as mag holders go I haven't seen any except for the 10/22 size mags. I think the best alternative might be a zippered pouch that you put on your belt, kinda a man-purse.
Nylon cloth (not the rigid Kydex) revolver speedloader holders work very well for 10/22 magazines so I presume they will fit the 96/44 mags too. Buy the larger size intended for S&W L or N frames or Ruger GP and Redhawk speedloaders.