The Case-Gard RL-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 RL-50 ammo box is supplied with a load label for recording load and sight data. Made in USA. This model is compatible with the following calibers: 224 Clark 240 Wby. Mag. 257 Roberts 270 Win. 25-06/280 Rem. 30 Gibbs 30-06 Spr. 318 Westley Richards 338-06 A-Square 35 Whelen 350 Legend 375 Rimless 2 1/4 6.5 Carcano 6.5×257 Roberts 6.5-06 A-Square 6.5x54mm Mann-Schone 6.5x 55 Swedish 7x 64 Brenneke 7×72 Rimmed 7×57/9.3x57mm MAUSER 8x57J 8×57 Mauser 7.7 Jap 7.7×58 Jap. 8mm-06 9.3×62.410 Shotshells upto 3″