The Case-Gard R-100 ammo box is designed for great afternoon of varmint or competitive shooting. It is made of indestructible polypropylene that will not warp, crack, chip, peel, expand or contract. The R-100 features a mechanical hinge and textured finish which makes it easier to grip and harder to scratch. Calibers: OAL 2.65″ 17 Fireball, 17 MACH 4, 17/221/222/223 Rem., 204 Ruger, 218 Bee, 222 Rem. Mag., 223 Rem. HP, 25-20 Win., 300 Blackout, 300 Sherwood, 300 Wisper, 32 Ideal, 32/401 Win. S.L., 350 Legend, 351 WSL, 38-55 Win., 5.56×45, 6×47, 6mm TCU, 6mm-223 Rem., 7.62 x 37 Musang.