I picked these up from ebay today....simple, yet brilliant idea. Allows you to per-measure out your powder at the bench before you head to the range. The plastic tubes are rugged and seal well with a stopper. They have a small enough opening, you can pour directly into the barrel.
You get 25 tubes for $10 (s/h included). Excellent deal
http://www.ebay.com/itm/Kentucky-Bil...-/291019285170
http://i.ebayimg.com/00/s/MTIwMFgxNj...StcDX/$_57.JPG