The J-20 series ammo case is a favorite of rifle enthusiasts throughout the world. It is made of indestructible polypropylene that will not warp, crack, chip, peel, expand or contract. Calibers- 219 Zipper, 20/22/24 Nosler, 22 BR, 22 Cheetah, 22 PPC, 22 Sav. HP, 22 Rem Jet, 220 Rus., 224 Valkyrie, 250/300/303 Sav., 30/ 35 Rem., 30 Rem. AR, 32-40/375/38-55 Win., 401 Win. S.L., 445 Super Mag., 450 Bushmaster, 460 S&W Mag., 5.6x52 Rimmed, 6.8mm Rem. Spl., 6mm BR-DX, 6mm Norma BR, 6mm PPC USA, 7.62x39 Rus., 7mm BR.