This is not new I know. But when I'm shooting my 16 ga 1847 muzzleloading shotgun at sporting clays at Bull Run, people get upset at the time I'm taking to load (unless I let them shoot a round). I ordered these small test tubes from Amazon....with gradations...$6.00 for 50. I'll load powder and shot aforetime...with 170 year old barrels, don't what to make a mistake in the field with shot dispensers and power flasks. And they're a lot cheaper than the advertised "quick load" stuff you can get at Cabellas. With the percussion cap linear dispenser...it greatly reduces load time..(and I still let good people shoot it...never seen such joy on hard core, O/U shooters). Just thought I'd share. - oh...and the little plastic wine containers you can buy at Giant for cooking and stuff are better for holding shot than anything....I tried the miniature Smirnoff vodka bottles...not big enough.