Coming in a convenient 3-pack, this kit allows for 300 additional primers to be loaded up ahead of a reloading session and ultimately improves overall round output. The X-10 Primer Tube Kits can work with any progressive press on the market. 100 Primer Capacity Per Tube Allows The Ability To Pre-load An Extra 300 Primers Ahead Of A Loading Session. Primer Tube Kits Are Available For Both Small And Large Primers.