What ever belt, slide or device you decide to use it's important to practice. I will out empty brass in my gun or snap caps and make dummy rounds for my belt or just go outside and use live ammo. In case you are about to chastise me for using live ammo I live in rural Vermont my nearest neighbor is far away.
As mentioned in an earlier post I have been using Murray Leather belts and slides. I shoot left handed and load with my right hand. I wear the slide in front and remove the shells from from right to left, when I get close to my intended target I will loosen or lift the shells slightly to make them easier to pull. The following series of pictures will show how I load my rifle. By holding them the way I do you can control the rounds and keep them parallel as they drop into the rifles chamber .
hope this helps.