As the NRA's first-ever Distinguished-Expert in Black Powder Pistol, I'll chime-in with my 2 cents' worth. To answer your question directly, I use the red plastic tubes with orange caps made by RMC (?) and distributed by Dixon Muzzleloading in Kempton, PA. They are now about $1.10 each. Between my son & I we have over 300 of them, organized in differently-labeled cigar boxes for each rifle, pistol or shotgun application.
Because I had to be dead-nuts accurate with a pistol at 50 yards in order to earn my DX, I selected to use the "little red tubes" and pre-measure each charge with my Cash powder measure, using the "tapping method" from above to make sure that I was getting as close to a weighed charge as possible. Poured charges would then be transported in the cigar box, and I'd use a second box for the empties so as to completely avoid any dry balls.
As I also suffer from a tinge of arthritis in the fingers, these little tubes make it easy for me to enjoy the hobby year-round. Once you get the "hang of it" and if you pour the tubes while also using a pistol loading stand, you can get to a point where you don't spill any powder at all, even with a good crosswind!
Each Club is a little different and some are more pickier than others about which aids old men can use to enjoy the sport. May you be as blessed as I and find two or more clubs that let you use the tubes :wink: .
Always at your service,
Dave
NRA Double Distinguished Expert (Pistol & Rifle)