Easy Storage: Convenient storage box features marked cavities for each caliber. You dont need to worry about the jags rolling around loose in the bottom of your toolbox or drawer anymore. 13 Solid Brass Jag Sizes.17 Caliber (5/40 threads). 22. 243/6mm. 25/6.5mm. 270/7mm. 30. 338/8mm. 357/9mm. 375. 40/.416. 44. 45. 50 Caliber (8/32 threads).