As Kiba said Ryobi makes this inflator tool which is cheapo at depot. After that take some vinyl tubing and cut up a case, jam the neck end of the case into one end of the tube (I used a Creedmoor necked to 7mm just 'cause.) And then cut a small ring out of the center of the case and jam that into the other end of the tube once it's fed through the Ryobi inflator thing end cap. This setup has gained some popularity around here and another shooter showed me how they threw it together so I always pass along the tip:What in the Ryobi F am I looking at???