Redding Reloading Drop Tube Adapter 17 - 20 Cal.. This adapter comes in a wide variety of different shapes and is a necessity if you are using the Redding Power Prime in conjunction with a standard feed tube and dropping dipper. Be sure you have the right adapter for your ammo when using the Redding Power Prime including a wide feed tube and connecting adapter. You will also need the right adapter for your particular brand of powder. Not all brands of powder are compatible with all brands of powder so it is a good idea to buy a few different adapters so you have a good mix to achieve the best results. Specifications for Redding Reloading Drop Tube Adapter: Manufacturer: Redding Reloading Projectile Caliber: .17 Caliber Quantity: 1 Features of Redding Reloading Drop Tube Adapter For .17 & .20 caliber Package Contents: Redding Reloading Drop Tube Adapter Redding Reloading 3817: Drop Tube Adapter 17 - 20 Cal.