The Case-Gard RM-50 ammo box is made of indestructible polypropylene that will not warp, crack, chip, peel, expand or contract. It features a full length mechanical hinge and textured finish which makes it easier to grip and harder to scratch. This Case-Gard RM-50 ammo box is supplied with a load label for recording load and sight data. Made in USA. This ammo box is compatible with the following calibers: 220 Swift, 300 Sav., 338 RCM, 225/243/307/308 Win., 338 Fed., 25/32/6mm Rem., 28-30 Sevens, 30 Rem. AR, 450 Bushmaster, 360 Nitro Express 2 1/4, 5.6×52 Rimmed, 6/6.5 Creedmoor, 6.5×50 Jap Arisaka, 6mm-284 Win., 7.35 Carcano, 7.5×54 French MAS, 7.65×53 Mauser, 7mmTCU and 7mm-08 Rem..