For speed loaders I use the (Plastic Tubes) that the 50.Cal Pyrodox Pellets come in when you buy them in a Blister Pack. There the perfect size to fit your bullets as there for 50Cal Pellets, if that's what you use. I put my measured powder in the bottom of them then the sabot, then on top of that I use a cloth cleaning patch for a snug fit so nothing rattles. I also cut a little off the plastic tube to custom fit my load. There's just enough diameter in them so the 50Cal Sabot is lose enough to slide right out when you tip it, grab the sabot, pour in the powder put the sabot in your barrel and send er home, they work great and there Free, of course you have to buy the Pellets in a blister pack to get em but they last forever. I also carry one in my shirt chest pocket for a quick easy access if needed.
BP