RE: C/T 50 cal.high plains sporter ammo question
plastic 35mm film containers, old prescription pill bottles, make them out of PVC pipe from the hardware store, purchase tubes and caps on line, speed loaders on line, you can even roll powder charges in paper (although I never done it).
There are lots of ways to get measured charges into the field. Go to most any black powder store on line and search speed loaders. They come in different calibers.