+1 on junkman_01's comment
Greetings Smokin'Joe, and welcome aboard
You're not the first to suggest a 6-at-once screw type cylinder loader. The main problem with this type of loader is you don't get to feel that each ball is well seated. Also, with your specific tool, the balls are set tangent to the face of the cylinder, you have no way of knowing if they are seated against the powder. Voids above the powder are to be avoided else you may have pressure problems.
Doc Hoy was working on screw type loaders with six individual rams that allow the balls to be set below the face of the cylinder. You might do a search for his latest loader posting.